mirror of https://gitee.com/openkylin/linux.git
950 lines
25 KiB
ArmAsm
950 lines
25 KiB
ArmAsm
/*
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* ppc64 MMU hashtable management routines
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*
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* (c) Copyright IBM Corp. 2003, 2005
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*
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* Maintained by: Benjamin Herrenschmidt
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* <benh@kernel.crashing.org>
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*
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* This file is covered by the GNU Public Licence v2 as
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* described in the kernel's COPYING file.
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*/
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#include <asm/reg.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <asm/types.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/cputable.h>
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.text
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/*
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* Stackframe:
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*
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* +-> Back chain (SP + 256)
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* | General register save area (SP + 112)
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* | Parameter save area (SP + 48)
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* | TOC save area (SP + 40)
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* | link editor doubleword (SP + 32)
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* | compiler doubleword (SP + 24)
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* | LR save area (SP + 16)
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* | CR save area (SP + 8)
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* SP ---> +-- Back chain (SP + 0)
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*/
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#define STACKFRAMESIZE 256
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/* Save parameters offsets */
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#define STK_PARM(i) (STACKFRAMESIZE + 48 + ((i)-3)*8)
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/* Save non-volatile offsets */
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#define STK_REG(i) (112 + ((i)-14)*8)
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#ifndef CONFIG_PPC_64K_PAGES
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/*****************************************************************************
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* *
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* 4K SW & 4K HW pages implementation *
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* *
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*****************************************************************************/
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/*
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* _hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
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* pte_t *ptep, unsigned long trap, int local, int ssize)
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*
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* Adds a 4K page to the hash table in a segment of 4K pages only
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*/
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_GLOBAL(__hash_page_4K)
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mflr r0
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std r0,16(r1)
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stdu r1,-STACKFRAMESIZE(r1)
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/* Save all params that we need after a function call */
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std r6,STK_PARM(r6)(r1)
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std r8,STK_PARM(r8)(r1)
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std r9,STK_PARM(r9)(r1)
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/* Save non-volatile registers.
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* r31 will hold "old PTE"
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* r30 is "new PTE"
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* r29 is "va"
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* r28 is a hash value
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* r27 is hashtab mask (maybe dynamic patched instead ?)
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*/
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std r27,STK_REG(r27)(r1)
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std r28,STK_REG(r28)(r1)
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std r29,STK_REG(r29)(r1)
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std r30,STK_REG(r30)(r1)
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std r31,STK_REG(r31)(r1)
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/* Step 1:
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*
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* Check permissions, atomically mark the linux PTE busy
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* and hashed.
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*/
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1:
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ldarx r31,0,r6
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/* Check access rights (access & ~(pte_val(*ptep))) */
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andc. r0,r4,r31
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bne- htab_wrong_access
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/* Check if PTE is busy */
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andi. r0,r31,_PAGE_BUSY
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/* If so, just bail out and refault if needed. Someone else
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* is changing this PTE anyway and might hash it.
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*/
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bne- htab_bail_ok
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/* Prepare new PTE value (turn access RW into DIRTY, then
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* add BUSY,HASHPTE and ACCESSED)
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*/
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rlwinm r30,r4,32-9+7,31-7,31-7 /* _PAGE_RW -> _PAGE_DIRTY */
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or r30,r30,r31
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ori r30,r30,_PAGE_BUSY | _PAGE_ACCESSED | _PAGE_HASHPTE
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/* Write the linux PTE atomically (setting busy) */
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stdcx. r30,0,r6
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bne- 1b
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isync
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/* Step 2:
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*
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* Insert/Update the HPTE in the hash table. At this point,
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* r4 (access) is re-useable, we use it for the new HPTE flags
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*/
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BEGIN_FTR_SECTION
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cmpdi r9,0 /* check segment size */
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bne 3f
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END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
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/* Calc va and put it in r29 */
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rldicr r29,r5,28,63-28
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rldicl r3,r3,0,36
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or r29,r3,r29
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/* Calculate hash value for primary slot and store it in r28 */
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rldicl r5,r5,0,25 /* vsid & 0x0000007fffffffff */
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rldicl r0,r3,64-12,48 /* (ea >> 12) & 0xffff */
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xor r28,r5,r0
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b 4f
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3: /* Calc VA and hash in r29 and r28 for 1T segment */
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sldi r29,r5,40 /* vsid << 40 */
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clrldi r3,r3,24 /* ea & 0xffffffffff */
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rldic r28,r5,25,25 /* (vsid << 25) & 0x7fffffffff */
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clrldi r5,r5,40 /* vsid & 0xffffff */
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rldicl r0,r3,64-12,36 /* (ea >> 12) & 0xfffffff */
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xor r28,r28,r5
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or r29,r3,r29 /* VA */
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xor r28,r28,r0 /* hash */
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/* Convert linux PTE bits into HW equivalents */
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4: andi. r3,r30,0x1fe /* Get basic set of flags */
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xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
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rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
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rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */
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and r0,r0,r4 /* _PAGE_RW & _PAGE_DIRTY ->r0 bit 30*/
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andc r0,r30,r0 /* r0 = pte & ~r0 */
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rlwimi r3,r0,32-1,31,31 /* Insert result into PP lsb */
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ori r3,r3,HPTE_R_C /* Always add "C" bit for perf. */
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/* We eventually do the icache sync here (maybe inline that
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* code rather than call a C function...)
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*/
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BEGIN_FTR_SECTION
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mr r4,r30
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mr r5,r7
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bl .hash_page_do_lazy_icache
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END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE)
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/* At this point, r3 contains new PP bits, save them in
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* place of "access" in the param area (sic)
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*/
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std r3,STK_PARM(r4)(r1)
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/* Get htab_hash_mask */
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ld r4,htab_hash_mask@got(2)
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ld r27,0(r4) /* htab_hash_mask -> r27 */
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/* Check if we may already be in the hashtable, in this case, we
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* go to out-of-line code to try to modify the HPTE
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*/
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andi. r0,r31,_PAGE_HASHPTE
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bne htab_modify_pte
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htab_insert_pte:
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/* Clear hpte bits in new pte (we also clear BUSY btw) and
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* add _PAGE_HASHPTE
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*/
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lis r0,_PAGE_HPTEFLAGS@h
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ori r0,r0,_PAGE_HPTEFLAGS@l
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andc r30,r30,r0
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ori r30,r30,_PAGE_HASHPTE
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/* physical address r5 */
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rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
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sldi r5,r5,PAGE_SHIFT
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/* Calculate primary group hash */
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and r0,r28,r27
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rldicr r3,r0,3,63-3 /* r3 = (hash & mask) << 3 */
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/* Call ppc_md.hpte_insert */
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ld r6,STK_PARM(r4)(r1) /* Retreive new pp bits */
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mr r4,r29 /* Retreive va */
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li r7,0 /* !bolted, !secondary */
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li r8,MMU_PAGE_4K /* page size */
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ld r9,STK_PARM(r9)(r1) /* segment size */
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_GLOBAL(htab_call_hpte_insert1)
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bl . /* Patched by htab_finish_init() */
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cmpdi 0,r3,0
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bge htab_pte_insert_ok /* Insertion successful */
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cmpdi 0,r3,-2 /* Critical failure */
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beq- htab_pte_insert_failure
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/* Now try secondary slot */
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/* physical address r5 */
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rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
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sldi r5,r5,PAGE_SHIFT
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/* Calculate secondary group hash */
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andc r0,r27,r28
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rldicr r3,r0,3,63-3 /* r0 = (~hash & mask) << 3 */
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/* Call ppc_md.hpte_insert */
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ld r6,STK_PARM(r4)(r1) /* Retreive new pp bits */
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mr r4,r29 /* Retreive va */
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li r7,HPTE_V_SECONDARY /* !bolted, secondary */
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li r8,MMU_PAGE_4K /* page size */
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ld r9,STK_PARM(r9)(r1) /* segment size */
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_GLOBAL(htab_call_hpte_insert2)
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bl . /* Patched by htab_finish_init() */
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cmpdi 0,r3,0
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bge+ htab_pte_insert_ok /* Insertion successful */
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cmpdi 0,r3,-2 /* Critical failure */
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beq- htab_pte_insert_failure
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/* Both are full, we need to evict something */
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mftb r0
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/* Pick a random group based on TB */
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andi. r0,r0,1
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mr r5,r28
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bne 2f
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not r5,r5
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2: and r0,r5,r27
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rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */
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/* Call ppc_md.hpte_remove */
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_GLOBAL(htab_call_hpte_remove)
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bl . /* Patched by htab_finish_init() */
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/* Try all again */
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b htab_insert_pte
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htab_bail_ok:
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li r3,0
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b htab_bail
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htab_pte_insert_ok:
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/* Insert slot number & secondary bit in PTE */
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rldimi r30,r3,12,63-15
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/* Write out the PTE with a normal write
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* (maybe add eieio may be good still ?)
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*/
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htab_write_out_pte:
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ld r6,STK_PARM(r6)(r1)
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std r30,0(r6)
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li r3, 0
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htab_bail:
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ld r27,STK_REG(r27)(r1)
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ld r28,STK_REG(r28)(r1)
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ld r29,STK_REG(r29)(r1)
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ld r30,STK_REG(r30)(r1)
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ld r31,STK_REG(r31)(r1)
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addi r1,r1,STACKFRAMESIZE
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ld r0,16(r1)
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mtlr r0
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blr
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htab_modify_pte:
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/* Keep PP bits in r4 and slot idx from the PTE around in r3 */
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mr r4,r3
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rlwinm r3,r31,32-12,29,31
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/* Secondary group ? if yes, get a inverted hash value */
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mr r5,r28
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andi. r0,r31,_PAGE_SECONDARY
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beq 1f
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not r5,r5
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1:
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/* Calculate proper slot value for ppc_md.hpte_updatepp */
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and r0,r5,r27
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rldicr r0,r0,3,63-3 /* r0 = (hash & mask) << 3 */
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add r3,r0,r3 /* add slot idx */
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/* Call ppc_md.hpte_updatepp */
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mr r5,r29 /* va */
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li r6,MMU_PAGE_4K /* page size */
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ld r7,STK_PARM(r9)(r1) /* segment size */
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ld r8,STK_PARM(r8)(r1) /* get "local" param */
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_GLOBAL(htab_call_hpte_updatepp)
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bl . /* Patched by htab_finish_init() */
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/* if we failed because typically the HPTE wasn't really here
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* we try an insertion.
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*/
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cmpdi 0,r3,-1
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beq- htab_insert_pte
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/* Clear the BUSY bit and Write out the PTE */
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li r0,_PAGE_BUSY
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andc r30,r30,r0
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b htab_write_out_pte
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htab_wrong_access:
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/* Bail out clearing reservation */
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stdcx. r31,0,r6
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li r3,1
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b htab_bail
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htab_pte_insert_failure:
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/* Bail out restoring old PTE */
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ld r6,STK_PARM(r6)(r1)
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std r31,0(r6)
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li r3,-1
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b htab_bail
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#else /* CONFIG_PPC_64K_PAGES */
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/*****************************************************************************
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* *
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* 64K SW & 4K or 64K HW in a 4K segment pages implementation *
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* *
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*****************************************************************************/
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/* _hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
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* pte_t *ptep, unsigned long trap, int local, int ssize,
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* int subpg_prot)
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*/
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/*
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* For now, we do NOT implement Admixed pages
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*/
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_GLOBAL(__hash_page_4K)
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mflr r0
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std r0,16(r1)
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stdu r1,-STACKFRAMESIZE(r1)
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/* Save all params that we need after a function call */
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std r6,STK_PARM(r6)(r1)
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std r8,STK_PARM(r8)(r1)
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std r9,STK_PARM(r9)(r1)
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/* Save non-volatile registers.
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* r31 will hold "old PTE"
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* r30 is "new PTE"
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* r29 is "va"
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* r28 is a hash value
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* r27 is hashtab mask (maybe dynamic patched instead ?)
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* r26 is the hidx mask
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* r25 is the index in combo page
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*/
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std r25,STK_REG(r25)(r1)
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std r26,STK_REG(r26)(r1)
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std r27,STK_REG(r27)(r1)
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std r28,STK_REG(r28)(r1)
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std r29,STK_REG(r29)(r1)
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std r30,STK_REG(r30)(r1)
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std r31,STK_REG(r31)(r1)
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/* Step 1:
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*
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* Check permissions, atomically mark the linux PTE busy
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* and hashed.
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*/
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1:
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ldarx r31,0,r6
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/* Check access rights (access & ~(pte_val(*ptep))) */
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andc. r0,r4,r31
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bne- htab_wrong_access
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/* Check if PTE is busy */
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andi. r0,r31,_PAGE_BUSY
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/* If so, just bail out and refault if needed. Someone else
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* is changing this PTE anyway and might hash it.
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*/
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bne- htab_bail_ok
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/* Prepare new PTE value (turn access RW into DIRTY, then
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* add BUSY and ACCESSED)
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*/
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rlwinm r30,r4,32-9+7,31-7,31-7 /* _PAGE_RW -> _PAGE_DIRTY */
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or r30,r30,r31
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ori r30,r30,_PAGE_BUSY | _PAGE_ACCESSED
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oris r30,r30,_PAGE_COMBO@h
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/* Write the linux PTE atomically (setting busy) */
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stdcx. r30,0,r6
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bne- 1b
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isync
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/* Step 2:
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*
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* Insert/Update the HPTE in the hash table. At this point,
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* r4 (access) is re-useable, we use it for the new HPTE flags
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*/
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/* Load the hidx index */
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rldicl r25,r3,64-12,60
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BEGIN_FTR_SECTION
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cmpdi r9,0 /* check segment size */
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bne 3f
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END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
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/* Calc va and put it in r29 */
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rldicr r29,r5,28,63-28 /* r29 = (vsid << 28) */
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rldicl r3,r3,0,36 /* r3 = (ea & 0x0fffffff) */
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or r29,r3,r29 /* r29 = va */
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/* Calculate hash value for primary slot and store it in r28 */
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rldicl r5,r5,0,25 /* vsid & 0x0000007fffffffff */
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rldicl r0,r3,64-12,48 /* (ea >> 12) & 0xffff */
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xor r28,r5,r0
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b 4f
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3: /* Calc VA and hash in r29 and r28 for 1T segment */
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sldi r29,r5,40 /* vsid << 40 */
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clrldi r3,r3,24 /* ea & 0xffffffffff */
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rldic r28,r5,25,25 /* (vsid << 25) & 0x7fffffffff */
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clrldi r5,r5,40 /* vsid & 0xffffff */
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rldicl r0,r3,64-12,36 /* (ea >> 12) & 0xfffffff */
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xor r28,r28,r5
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or r29,r3,r29 /* VA */
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xor r28,r28,r0 /* hash */
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/* Convert linux PTE bits into HW equivalents */
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4:
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#ifdef CONFIG_PPC_SUBPAGE_PROT
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andc r10,r30,r10
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andi. r3,r10,0x1fe /* Get basic set of flags */
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rlwinm r0,r10,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
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#else
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andi. r3,r30,0x1fe /* Get basic set of flags */
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rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
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#endif
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xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
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rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */
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and r0,r0,r4 /* _PAGE_RW & _PAGE_DIRTY ->r0 bit 30*/
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andc r0,r3,r0 /* r0 = pte & ~r0 */
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rlwimi r3,r0,32-1,31,31 /* Insert result into PP lsb */
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ori r3,r3,HPTE_R_C /* Always add "C" bit for perf. */
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/* We eventually do the icache sync here (maybe inline that
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* code rather than call a C function...)
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*/
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BEGIN_FTR_SECTION
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mr r4,r30
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mr r5,r7
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bl .hash_page_do_lazy_icache
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END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE)
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/* At this point, r3 contains new PP bits, save them in
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|
* place of "access" in the param area (sic)
|
|
*/
|
|
std r3,STK_PARM(r4)(r1)
|
|
|
|
/* Get htab_hash_mask */
|
|
ld r4,htab_hash_mask@got(2)
|
|
ld r27,0(r4) /* htab_hash_mask -> r27 */
|
|
|
|
/* Check if we may already be in the hashtable, in this case, we
|
|
* go to out-of-line code to try to modify the HPTE. We look for
|
|
* the bit at (1 >> (index + 32))
|
|
*/
|
|
rldicl. r0,r31,64-12,48
|
|
li r26,0 /* Default hidx */
|
|
beq htab_insert_pte
|
|
|
|
/*
|
|
* Check if the pte was already inserted into the hash table
|
|
* as a 64k HW page, and invalidate the 64k HPTE if so.
|
|
*/
|
|
andis. r0,r31,_PAGE_COMBO@h
|
|
beq htab_inval_old_hpte
|
|
|
|
ld r6,STK_PARM(r6)(r1)
|
|
ori r26,r6,0x8000 /* Load the hidx mask */
|
|
ld r26,0(r26)
|
|
addi r5,r25,36 /* Check actual HPTE_SUB bit, this */
|
|
rldcr. r0,r31,r5,0 /* must match pgtable.h definition */
|
|
bne htab_modify_pte
|
|
|
|
htab_insert_pte:
|
|
/* real page number in r5, PTE RPN value + index */
|
|
andis. r0,r31,_PAGE_4K_PFN@h
|
|
srdi r5,r31,PTE_RPN_SHIFT
|
|
bne- htab_special_pfn
|
|
sldi r5,r5,PAGE_SHIFT-HW_PAGE_SHIFT
|
|
add r5,r5,r25
|
|
htab_special_pfn:
|
|
sldi r5,r5,HW_PAGE_SHIFT
|
|
|
|
/* Calculate primary group hash */
|
|
and r0,r28,r27
|
|
rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */
|
|
|
|
/* Call ppc_md.hpte_insert */
|
|
ld r6,STK_PARM(r4)(r1) /* Retreive new pp bits */
|
|
mr r4,r29 /* Retreive va */
|
|
li r7,0 /* !bolted, !secondary */
|
|
li r8,MMU_PAGE_4K /* page size */
|
|
ld r9,STK_PARM(r9)(r1) /* segment size */
|
|
_GLOBAL(htab_call_hpte_insert1)
|
|
bl . /* patched by htab_finish_init() */
|
|
cmpdi 0,r3,0
|
|
bge htab_pte_insert_ok /* Insertion successful */
|
|
cmpdi 0,r3,-2 /* Critical failure */
|
|
beq- htab_pte_insert_failure
|
|
|
|
/* Now try secondary slot */
|
|
|
|
/* real page number in r5, PTE RPN value + index */
|
|
andis. r0,r31,_PAGE_4K_PFN@h
|
|
srdi r5,r31,PTE_RPN_SHIFT
|
|
bne- 3f
|
|
sldi r5,r5,PAGE_SHIFT-HW_PAGE_SHIFT
|
|
add r5,r5,r25
|
|
3: sldi r5,r5,HW_PAGE_SHIFT
|
|
|
|
/* Calculate secondary group hash */
|
|
andc r0,r27,r28
|
|
rldicr r3,r0,3,63-3 /* r0 = (~hash & mask) << 3 */
|
|
|
|
/* Call ppc_md.hpte_insert */
|
|
ld r6,STK_PARM(r4)(r1) /* Retreive new pp bits */
|
|
mr r4,r29 /* Retreive va */
|
|
li r7,HPTE_V_SECONDARY /* !bolted, secondary */
|
|
li r8,MMU_PAGE_4K /* page size */
|
|
ld r9,STK_PARM(r9)(r1) /* segment size */
|
|
_GLOBAL(htab_call_hpte_insert2)
|
|
bl . /* patched by htab_finish_init() */
|
|
cmpdi 0,r3,0
|
|
bge+ htab_pte_insert_ok /* Insertion successful */
|
|
cmpdi 0,r3,-2 /* Critical failure */
|
|
beq- htab_pte_insert_failure
|
|
|
|
/* Both are full, we need to evict something */
|
|
mftb r0
|
|
/* Pick a random group based on TB */
|
|
andi. r0,r0,1
|
|
mr r5,r28
|
|
bne 2f
|
|
not r5,r5
|
|
2: and r0,r5,r27
|
|
rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */
|
|
/* Call ppc_md.hpte_remove */
|
|
_GLOBAL(htab_call_hpte_remove)
|
|
bl . /* patched by htab_finish_init() */
|
|
|
|
/* Try all again */
|
|
b htab_insert_pte
|
|
|
|
/*
|
|
* Call out to C code to invalidate an 64k HW HPTE that is
|
|
* useless now that the segment has been switched to 4k pages.
|
|
*/
|
|
htab_inval_old_hpte:
|
|
mr r3,r29 /* virtual addr */
|
|
mr r4,r31 /* PTE.pte */
|
|
li r5,0 /* PTE.hidx */
|
|
li r6,MMU_PAGE_64K /* psize */
|
|
ld r7,STK_PARM(r9)(r1) /* ssize */
|
|
ld r8,STK_PARM(r8)(r1) /* local */
|
|
bl .flush_hash_page
|
|
/* Clear out _PAGE_HPTE_SUB bits in the new linux PTE */
|
|
lis r0,_PAGE_HPTE_SUB@h
|
|
ori r0,r0,_PAGE_HPTE_SUB@l
|
|
andc r30,r30,r0
|
|
b htab_insert_pte
|
|
|
|
htab_bail_ok:
|
|
li r3,0
|
|
b htab_bail
|
|
|
|
htab_pte_insert_ok:
|
|
/* Insert slot number & secondary bit in PTE second half,
|
|
* clear _PAGE_BUSY and set approriate HPTE slot bit
|
|
*/
|
|
ld r6,STK_PARM(r6)(r1)
|
|
li r0,_PAGE_BUSY
|
|
andc r30,r30,r0
|
|
/* HPTE SUB bit */
|
|
li r0,1
|
|
subfic r5,r25,27 /* Must match bit position in */
|
|
sld r0,r0,r5 /* pgtable.h */
|
|
or r30,r30,r0
|
|
/* hindx */
|
|
sldi r5,r25,2
|
|
sld r3,r3,r5
|
|
li r4,0xf
|
|
sld r4,r4,r5
|
|
andc r26,r26,r4
|
|
or r26,r26,r3
|
|
ori r5,r6,0x8000
|
|
std r26,0(r5)
|
|
lwsync
|
|
std r30,0(r6)
|
|
li r3, 0
|
|
htab_bail:
|
|
ld r25,STK_REG(r25)(r1)
|
|
ld r26,STK_REG(r26)(r1)
|
|
ld r27,STK_REG(r27)(r1)
|
|
ld r28,STK_REG(r28)(r1)
|
|
ld r29,STK_REG(r29)(r1)
|
|
ld r30,STK_REG(r30)(r1)
|
|
ld r31,STK_REG(r31)(r1)
|
|
addi r1,r1,STACKFRAMESIZE
|
|
ld r0,16(r1)
|
|
mtlr r0
|
|
blr
|
|
|
|
htab_modify_pte:
|
|
/* Keep PP bits in r4 and slot idx from the PTE around in r3 */
|
|
mr r4,r3
|
|
sldi r5,r25,2
|
|
srd r3,r26,r5
|
|
|
|
/* Secondary group ? if yes, get a inverted hash value */
|
|
mr r5,r28
|
|
andi. r0,r3,0x8 /* page secondary ? */
|
|
beq 1f
|
|
not r5,r5
|
|
1: andi. r3,r3,0x7 /* extract idx alone */
|
|
|
|
/* Calculate proper slot value for ppc_md.hpte_updatepp */
|
|
and r0,r5,r27
|
|
rldicr r0,r0,3,63-3 /* r0 = (hash & mask) << 3 */
|
|
add r3,r0,r3 /* add slot idx */
|
|
|
|
/* Call ppc_md.hpte_updatepp */
|
|
mr r5,r29 /* va */
|
|
li r6,MMU_PAGE_4K /* page size */
|
|
ld r7,STK_PARM(r9)(r1) /* segment size */
|
|
ld r8,STK_PARM(r8)(r1) /* get "local" param */
|
|
_GLOBAL(htab_call_hpte_updatepp)
|
|
bl . /* patched by htab_finish_init() */
|
|
|
|
/* if we failed because typically the HPTE wasn't really here
|
|
* we try an insertion.
|
|
*/
|
|
cmpdi 0,r3,-1
|
|
beq- htab_insert_pte
|
|
|
|
/* Clear the BUSY bit and Write out the PTE */
|
|
li r0,_PAGE_BUSY
|
|
andc r30,r30,r0
|
|
ld r6,STK_PARM(r6)(r1)
|
|
std r30,0(r6)
|
|
li r3,0
|
|
b htab_bail
|
|
|
|
htab_wrong_access:
|
|
/* Bail out clearing reservation */
|
|
stdcx. r31,0,r6
|
|
li r3,1
|
|
b htab_bail
|
|
|
|
htab_pte_insert_failure:
|
|
/* Bail out restoring old PTE */
|
|
ld r6,STK_PARM(r6)(r1)
|
|
std r31,0(r6)
|
|
li r3,-1
|
|
b htab_bail
|
|
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
#ifdef CONFIG_PPC_HAS_HASH_64K
|
|
|
|
/*****************************************************************************
|
|
* *
|
|
* 64K SW & 64K HW in a 64K segment pages implementation *
|
|
* *
|
|
*****************************************************************************/
|
|
|
|
_GLOBAL(__hash_page_64K)
|
|
mflr r0
|
|
std r0,16(r1)
|
|
stdu r1,-STACKFRAMESIZE(r1)
|
|
/* Save all params that we need after a function call */
|
|
std r6,STK_PARM(r6)(r1)
|
|
std r8,STK_PARM(r8)(r1)
|
|
std r9,STK_PARM(r9)(r1)
|
|
|
|
/* Save non-volatile registers.
|
|
* r31 will hold "old PTE"
|
|
* r30 is "new PTE"
|
|
* r29 is "va"
|
|
* r28 is a hash value
|
|
* r27 is hashtab mask (maybe dynamic patched instead ?)
|
|
*/
|
|
std r27,STK_REG(r27)(r1)
|
|
std r28,STK_REG(r28)(r1)
|
|
std r29,STK_REG(r29)(r1)
|
|
std r30,STK_REG(r30)(r1)
|
|
std r31,STK_REG(r31)(r1)
|
|
|
|
/* Step 1:
|
|
*
|
|
* Check permissions, atomically mark the linux PTE busy
|
|
* and hashed.
|
|
*/
|
|
1:
|
|
ldarx r31,0,r6
|
|
/* Check access rights (access & ~(pte_val(*ptep))) */
|
|
andc. r0,r4,r31
|
|
bne- ht64_wrong_access
|
|
/* Check if PTE is busy */
|
|
andi. r0,r31,_PAGE_BUSY
|
|
/* If so, just bail out and refault if needed. Someone else
|
|
* is changing this PTE anyway and might hash it.
|
|
*/
|
|
bne- ht64_bail_ok
|
|
BEGIN_FTR_SECTION
|
|
/* Check if PTE has the cache-inhibit bit set */
|
|
andi. r0,r31,_PAGE_NO_CACHE
|
|
/* If so, bail out and refault as a 4k page */
|
|
bne- ht64_bail_ok
|
|
END_FTR_SECTION_IFCLR(CPU_FTR_CI_LARGE_PAGE)
|
|
/* Prepare new PTE value (turn access RW into DIRTY, then
|
|
* add BUSY and ACCESSED)
|
|
*/
|
|
rlwinm r30,r4,32-9+7,31-7,31-7 /* _PAGE_RW -> _PAGE_DIRTY */
|
|
or r30,r30,r31
|
|
ori r30,r30,_PAGE_BUSY | _PAGE_ACCESSED
|
|
/* Write the linux PTE atomically (setting busy) */
|
|
stdcx. r30,0,r6
|
|
bne- 1b
|
|
isync
|
|
|
|
/* Step 2:
|
|
*
|
|
* Insert/Update the HPTE in the hash table. At this point,
|
|
* r4 (access) is re-useable, we use it for the new HPTE flags
|
|
*/
|
|
|
|
BEGIN_FTR_SECTION
|
|
cmpdi r9,0 /* check segment size */
|
|
bne 3f
|
|
END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
|
|
/* Calc va and put it in r29 */
|
|
rldicr r29,r5,28,63-28
|
|
rldicl r3,r3,0,36
|
|
or r29,r3,r29
|
|
|
|
/* Calculate hash value for primary slot and store it in r28 */
|
|
rldicl r5,r5,0,25 /* vsid & 0x0000007fffffffff */
|
|
rldicl r0,r3,64-16,52 /* (ea >> 16) & 0xfff */
|
|
xor r28,r5,r0
|
|
b 4f
|
|
|
|
3: /* Calc VA and hash in r29 and r28 for 1T segment */
|
|
sldi r29,r5,40 /* vsid << 40 */
|
|
clrldi r3,r3,24 /* ea & 0xffffffffff */
|
|
rldic r28,r5,25,25 /* (vsid << 25) & 0x7fffffffff */
|
|
clrldi r5,r5,40 /* vsid & 0xffffff */
|
|
rldicl r0,r3,64-16,40 /* (ea >> 16) & 0xffffff */
|
|
xor r28,r28,r5
|
|
or r29,r3,r29 /* VA */
|
|
xor r28,r28,r0 /* hash */
|
|
|
|
/* Convert linux PTE bits into HW equivalents */
|
|
4: andi. r3,r30,0x1fe /* Get basic set of flags */
|
|
xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
|
|
rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
|
|
rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */
|
|
and r0,r0,r4 /* _PAGE_RW & _PAGE_DIRTY ->r0 bit 30*/
|
|
andc r0,r30,r0 /* r0 = pte & ~r0 */
|
|
rlwimi r3,r0,32-1,31,31 /* Insert result into PP lsb */
|
|
ori r3,r3,HPTE_R_C /* Always add "C" bit for perf. */
|
|
|
|
/* We eventually do the icache sync here (maybe inline that
|
|
* code rather than call a C function...)
|
|
*/
|
|
BEGIN_FTR_SECTION
|
|
mr r4,r30
|
|
mr r5,r7
|
|
bl .hash_page_do_lazy_icache
|
|
END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE)
|
|
|
|
/* At this point, r3 contains new PP bits, save them in
|
|
* place of "access" in the param area (sic)
|
|
*/
|
|
std r3,STK_PARM(r4)(r1)
|
|
|
|
/* Get htab_hash_mask */
|
|
ld r4,htab_hash_mask@got(2)
|
|
ld r27,0(r4) /* htab_hash_mask -> r27 */
|
|
|
|
/* Check if we may already be in the hashtable, in this case, we
|
|
* go to out-of-line code to try to modify the HPTE
|
|
*/
|
|
rldicl. r0,r31,64-12,48
|
|
bne ht64_modify_pte
|
|
|
|
ht64_insert_pte:
|
|
/* Clear hpte bits in new pte (we also clear BUSY btw) and
|
|
* add _PAGE_HPTE_SUB0
|
|
*/
|
|
lis r0,_PAGE_HPTEFLAGS@h
|
|
ori r0,r0,_PAGE_HPTEFLAGS@l
|
|
andc r30,r30,r0
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
oris r30,r30,_PAGE_HPTE_SUB0@h
|
|
#else
|
|
ori r30,r30,_PAGE_HASHPTE
|
|
#endif
|
|
/* Phyical address in r5 */
|
|
rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
|
|
sldi r5,r5,PAGE_SHIFT
|
|
|
|
/* Calculate primary group hash */
|
|
and r0,r28,r27
|
|
rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */
|
|
|
|
/* Call ppc_md.hpte_insert */
|
|
ld r6,STK_PARM(r4)(r1) /* Retreive new pp bits */
|
|
mr r4,r29 /* Retreive va */
|
|
li r7,0 /* !bolted, !secondary */
|
|
li r8,MMU_PAGE_64K
|
|
ld r9,STK_PARM(r9)(r1) /* segment size */
|
|
_GLOBAL(ht64_call_hpte_insert1)
|
|
bl . /* patched by htab_finish_init() */
|
|
cmpdi 0,r3,0
|
|
bge ht64_pte_insert_ok /* Insertion successful */
|
|
cmpdi 0,r3,-2 /* Critical failure */
|
|
beq- ht64_pte_insert_failure
|
|
|
|
/* Now try secondary slot */
|
|
|
|
/* Phyical address in r5 */
|
|
rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
|
|
sldi r5,r5,PAGE_SHIFT
|
|
|
|
/* Calculate secondary group hash */
|
|
andc r0,r27,r28
|
|
rldicr r3,r0,3,63-3 /* r0 = (~hash & mask) << 3 */
|
|
|
|
/* Call ppc_md.hpte_insert */
|
|
ld r6,STK_PARM(r4)(r1) /* Retreive new pp bits */
|
|
mr r4,r29 /* Retreive va */
|
|
li r7,HPTE_V_SECONDARY /* !bolted, secondary */
|
|
li r8,MMU_PAGE_64K
|
|
ld r9,STK_PARM(r9)(r1) /* segment size */
|
|
_GLOBAL(ht64_call_hpte_insert2)
|
|
bl . /* patched by htab_finish_init() */
|
|
cmpdi 0,r3,0
|
|
bge+ ht64_pte_insert_ok /* Insertion successful */
|
|
cmpdi 0,r3,-2 /* Critical failure */
|
|
beq- ht64_pte_insert_failure
|
|
|
|
/* Both are full, we need to evict something */
|
|
mftb r0
|
|
/* Pick a random group based on TB */
|
|
andi. r0,r0,1
|
|
mr r5,r28
|
|
bne 2f
|
|
not r5,r5
|
|
2: and r0,r5,r27
|
|
rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */
|
|
/* Call ppc_md.hpte_remove */
|
|
_GLOBAL(ht64_call_hpte_remove)
|
|
bl . /* patched by htab_finish_init() */
|
|
|
|
/* Try all again */
|
|
b ht64_insert_pte
|
|
|
|
ht64_bail_ok:
|
|
li r3,0
|
|
b ht64_bail
|
|
|
|
ht64_pte_insert_ok:
|
|
/* Insert slot number & secondary bit in PTE */
|
|
rldimi r30,r3,12,63-15
|
|
|
|
/* Write out the PTE with a normal write
|
|
* (maybe add eieio may be good still ?)
|
|
*/
|
|
ht64_write_out_pte:
|
|
ld r6,STK_PARM(r6)(r1)
|
|
std r30,0(r6)
|
|
li r3, 0
|
|
ht64_bail:
|
|
ld r27,STK_REG(r27)(r1)
|
|
ld r28,STK_REG(r28)(r1)
|
|
ld r29,STK_REG(r29)(r1)
|
|
ld r30,STK_REG(r30)(r1)
|
|
ld r31,STK_REG(r31)(r1)
|
|
addi r1,r1,STACKFRAMESIZE
|
|
ld r0,16(r1)
|
|
mtlr r0
|
|
blr
|
|
|
|
ht64_modify_pte:
|
|
/* Keep PP bits in r4 and slot idx from the PTE around in r3 */
|
|
mr r4,r3
|
|
rlwinm r3,r31,32-12,29,31
|
|
|
|
/* Secondary group ? if yes, get a inverted hash value */
|
|
mr r5,r28
|
|
andi. r0,r31,_PAGE_F_SECOND
|
|
beq 1f
|
|
not r5,r5
|
|
1:
|
|
/* Calculate proper slot value for ppc_md.hpte_updatepp */
|
|
and r0,r5,r27
|
|
rldicr r0,r0,3,63-3 /* r0 = (hash & mask) << 3 */
|
|
add r3,r0,r3 /* add slot idx */
|
|
|
|
/* Call ppc_md.hpte_updatepp */
|
|
mr r5,r29 /* va */
|
|
li r6,MMU_PAGE_64K
|
|
ld r7,STK_PARM(r9)(r1) /* segment size */
|
|
ld r8,STK_PARM(r8)(r1) /* get "local" param */
|
|
_GLOBAL(ht64_call_hpte_updatepp)
|
|
bl . /* patched by htab_finish_init() */
|
|
|
|
/* if we failed because typically the HPTE wasn't really here
|
|
* we try an insertion.
|
|
*/
|
|
cmpdi 0,r3,-1
|
|
beq- ht64_insert_pte
|
|
|
|
/* Clear the BUSY bit and Write out the PTE */
|
|
li r0,_PAGE_BUSY
|
|
andc r30,r30,r0
|
|
b ht64_write_out_pte
|
|
|
|
ht64_wrong_access:
|
|
/* Bail out clearing reservation */
|
|
stdcx. r31,0,r6
|
|
li r3,1
|
|
b ht64_bail
|
|
|
|
ht64_pte_insert_failure:
|
|
/* Bail out restoring old PTE */
|
|
ld r6,STK_PARM(r6)(r1)
|
|
std r31,0(r6)
|
|
li r3,-1
|
|
b ht64_bail
|
|
|
|
|
|
#endif /* CONFIG_PPC_HAS_HASH_64K */
|
|
|
|
|
|
/*****************************************************************************
|
|
* *
|
|
* Huge pages implementation is in hugetlbpage.c *
|
|
* *
|
|
*****************************************************************************/
|