148 lines
4.4 KiB
ArmAsm
148 lines
4.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/errno.h>
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/assembler.h>
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.text
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/*
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* Implementation of MPIDR_EL1 hash algorithm through shifting
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* and OR'ing.
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*
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* @dst: register containing hash result
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* @rs0: register containing affinity level 0 bit shift
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* @rs1: register containing affinity level 1 bit shift
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* @rs2: register containing affinity level 2 bit shift
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* @rs3: register containing affinity level 3 bit shift
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* @mpidr: register containing MPIDR_EL1 value
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* @mask: register containing MPIDR mask
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*
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* Pseudo C-code:
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*
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*u32 dst;
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*
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*compute_mpidr_hash(u32 rs0, u32 rs1, u32 rs2, u32 rs3, u64 mpidr, u64 mask) {
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* u32 aff0, aff1, aff2, aff3;
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* u64 mpidr_masked = mpidr & mask;
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* aff0 = mpidr_masked & 0xff;
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* aff1 = mpidr_masked & 0xff00;
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* aff2 = mpidr_masked & 0xff0000;
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* aff2 = mpidr_masked & 0xff00000000;
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* dst = (aff0 >> rs0 | aff1 >> rs1 | aff2 >> rs2 | aff3 >> rs3);
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*}
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* Input registers: rs0, rs1, rs2, rs3, mpidr, mask
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* Output register: dst
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* Note: input and output registers must be disjoint register sets
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(eg: a macro instance with mpidr = x1 and dst = x1 is invalid)
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*/
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.macro compute_mpidr_hash dst, rs0, rs1, rs2, rs3, mpidr, mask
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and \mpidr, \mpidr, \mask // mask out MPIDR bits
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and \dst, \mpidr, #0xff // mask=aff0
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lsr \dst ,\dst, \rs0 // dst=aff0>>rs0
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and \mask, \mpidr, #0xff00 // mask = aff1
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lsr \mask ,\mask, \rs1
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orr \dst, \dst, \mask // dst|=(aff1>>rs1)
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and \mask, \mpidr, #0xff0000 // mask = aff2
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lsr \mask ,\mask, \rs2
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orr \dst, \dst, \mask // dst|=(aff2>>rs2)
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and \mask, \mpidr, #0xff00000000 // mask = aff3
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lsr \mask ,\mask, \rs3
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orr \dst, \dst, \mask // dst|=(aff3>>rs3)
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.endm
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/*
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* Save CPU state in the provided sleep_stack_data area, and publish its
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* location for cpu_resume()'s use in sleep_save_stash.
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*
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* cpu_resume() will restore this saved state, and return. Because the
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* link-register is saved and restored, it will appear to return from this
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* function. So that the caller can tell the suspend/resume paths apart,
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* __cpu_suspend_enter() will always return a non-zero value, whereas the
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* path through cpu_resume() will return 0.
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*
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* x0 = struct sleep_stack_data area
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*/
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ENTRY(__cpu_suspend_enter)
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stp x29, lr, [x0, #SLEEP_STACK_DATA_CALLEE_REGS]
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stp x19, x20, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+16]
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stp x21, x22, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+32]
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stp x23, x24, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+48]
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stp x25, x26, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+64]
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stp x27, x28, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+80]
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/* save the sp in cpu_suspend_ctx */
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mov x2, sp
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str x2, [x0, #SLEEP_STACK_DATA_SYSTEM_REGS + CPU_CTX_SP]
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/* find the mpidr_hash */
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ldr_l x1, sleep_save_stash
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mrs x7, mpidr_el1
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adr_l x9, mpidr_hash
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ldr x10, [x9, #MPIDR_HASH_MASK]
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/*
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* Following code relies on the struct mpidr_hash
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* members size.
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*/
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ldp w3, w4, [x9, #MPIDR_HASH_SHIFTS]
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ldp w5, w6, [x9, #(MPIDR_HASH_SHIFTS + 8)]
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compute_mpidr_hash x8, x3, x4, x5, x6, x7, x10
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add x1, x1, x8, lsl #3
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str x0, [x1]
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add x0, x0, #SLEEP_STACK_DATA_SYSTEM_REGS
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stp x29, lr, [sp, #-16]!
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bl cpu_do_suspend
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ldp x29, lr, [sp], #16
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mov x0, #1
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ret
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ENDPROC(__cpu_suspend_enter)
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.pushsection ".idmap.text", "ax"
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ENTRY(cpu_resume)
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bl el2_setup // if in EL2 drop to EL1 cleanly
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bl __cpu_setup
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/* enable the MMU early - so we can access sleep_save_stash by va */
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bl __enable_mmu
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ldr x8, =_cpu_resume
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br x8
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ENDPROC(cpu_resume)
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.ltorg
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.popsection
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ENTRY(_cpu_resume)
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mrs x1, mpidr_el1
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adr_l x8, mpidr_hash // x8 = struct mpidr_hash virt address
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/* retrieve mpidr_hash members to compute the hash */
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ldr x2, [x8, #MPIDR_HASH_MASK]
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ldp w3, w4, [x8, #MPIDR_HASH_SHIFTS]
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ldp w5, w6, [x8, #(MPIDR_HASH_SHIFTS + 8)]
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compute_mpidr_hash x7, x3, x4, x5, x6, x1, x2
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/* x7 contains hash index, let's use it to grab context pointer */
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ldr_l x0, sleep_save_stash
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ldr x0, [x0, x7, lsl #3]
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add x29, x0, #SLEEP_STACK_DATA_CALLEE_REGS
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add x0, x0, #SLEEP_STACK_DATA_SYSTEM_REGS
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/* load sp from context */
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ldr x2, [x0, #CPU_CTX_SP]
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mov sp, x2
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/*
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* cpu_do_resume expects x0 to contain context address pointer
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*/
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bl cpu_do_resume
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#ifdef CONFIG_KASAN
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mov x0, sp
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bl kasan_unpoison_task_stack_below
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#endif
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ldp x19, x20, [x29, #16]
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ldp x21, x22, [x29, #32]
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ldp x23, x24, [x29, #48]
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ldp x25, x26, [x29, #64]
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ldp x27, x28, [x29, #80]
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ldp x29, lr, [x29]
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mov x0, #0
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ret
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ENDPROC(_cpu_resume)
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