476 lines
13 KiB
C
476 lines
13 KiB
C
/*
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* arch/alpha/boot/bootpz.c
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*
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* Copyright (C) 1997 Jay Estabrook
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*
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* This file is used for creating a compressed BOOTP file for the
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* Linux/AXP kernel
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*
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* based significantly on the arch/alpha/boot/main.c of Linus Torvalds
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* and the decompression code from MILO.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <generated/utsrelease.h>
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#include <linux/mm.h>
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#include <asm/console.h>
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#include <asm/hwrpb.h>
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#include <asm/pgtable.h>
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#include <asm/io.h>
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#include <stdarg.h>
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#include "kzsize.h"
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/* FIXME FIXME FIXME */
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#define MALLOC_AREA_SIZE 0x200000 /* 2MB for now */
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/* FIXME FIXME FIXME */
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/*
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WARNING NOTE
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It is very possible that turning on additional messages may cause
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kernel image corruption due to stack usage to do the printing.
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*/
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#undef DEBUG_CHECK_RANGE
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#undef DEBUG_ADDRESSES
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#undef DEBUG_LAST_STEPS
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extern unsigned long switch_to_osf_pal(unsigned long nr,
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struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
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unsigned long *vptb);
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extern int decompress_kernel(void* destination, void *source,
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size_t ksize, size_t kzsize);
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extern void move_stack(unsigned long new_stack);
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struct hwrpb_struct *hwrpb = INIT_HWRPB;
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static struct pcb_struct pcb_va[1];
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/*
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* Find a physical address of a virtual object..
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*
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* This is easy using the virtual page table address.
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*/
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#define VPTB ((unsigned long *) 0x200000000)
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static inline unsigned long
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find_pa(unsigned long address)
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{
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unsigned long result;
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result = VPTB[address >> 13];
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result >>= 32;
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result <<= 13;
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result |= address & 0x1fff;
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return result;
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}
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int
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check_range(unsigned long vstart, unsigned long vend,
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unsigned long kstart, unsigned long kend)
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{
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unsigned long vaddr, kaddr;
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#ifdef DEBUG_CHECK_RANGE
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srm_printk("check_range: V[0x%lx:0x%lx] K[0x%lx:0x%lx]\n",
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vstart, vend, kstart, kend);
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#endif
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/* do some range checking for detecting an overlap... */
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for (vaddr = vstart; vaddr <= vend; vaddr += PAGE_SIZE)
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{
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kaddr = (find_pa(vaddr) | PAGE_OFFSET);
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if (kaddr >= kstart && kaddr <= kend)
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{
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#ifdef DEBUG_CHECK_RANGE
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srm_printk("OVERLAP: vaddr 0x%lx kaddr 0x%lx"
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" [0x%lx:0x%lx]\n",
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vaddr, kaddr, kstart, kend);
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#endif
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return 1;
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}
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}
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return 0;
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}
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/*
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* This function moves into OSF/1 pal-code, and has a temporary
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* PCB for that. The kernel proper should replace this PCB with
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* the real one as soon as possible.
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*
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* The page table muckery in here depends on the fact that the boot
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* code has the L1 page table identity-map itself in the second PTE
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* in the L1 page table. Thus the L1-page is virtually addressable
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* itself (through three levels) at virtual address 0x200802000.
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*/
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#define L1 ((unsigned long *) 0x200802000)
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void
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pal_init(void)
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{
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unsigned long i, rev;
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struct percpu_struct * percpu;
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struct pcb_struct * pcb_pa;
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/* Create the dummy PCB. */
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pcb_va->ksp = 0;
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pcb_va->usp = 0;
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pcb_va->ptbr = L1[1] >> 32;
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pcb_va->asn = 0;
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pcb_va->pcc = 0;
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pcb_va->unique = 0;
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pcb_va->flags = 1;
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pcb_va->res1 = 0;
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pcb_va->res2 = 0;
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pcb_pa = (struct pcb_struct *)find_pa((unsigned long)pcb_va);
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/*
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* a0 = 2 (OSF)
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* a1 = return address, but we give the asm the vaddr of the PCB
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* a2 = physical addr of PCB
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* a3 = new virtual page table pointer
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* a4 = KSP (but the asm sets it)
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*/
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srm_printk("Switching to OSF PAL-code... ");
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i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB);
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if (i) {
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srm_printk("failed, code %ld\n", i);
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__halt();
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}
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percpu = (struct percpu_struct *)
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(INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB);
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rev = percpu->pal_revision = percpu->palcode_avail[2];
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srm_printk("OK (rev %lx)\n", rev);
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tbia(); /* do it directly in case we are SMP */
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}
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/*
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* Start the kernel.
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*/
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static inline void
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runkernel(void)
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{
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__asm__ __volatile__(
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"bis %0,%0,$27\n\t"
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"jmp ($27)"
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: /* no outputs: it doesn't even return */
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: "r" (START_ADDR));
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}
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/* Must record the SP (it is virtual) on entry, so we can make sure
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not to overwrite it during movement or decompression. */
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unsigned long SP_on_entry;
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/* Calculate the kernel image address based on the end of the BOOTP
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bootstrapper (ie this program).
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*/
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extern char _end;
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#define KERNEL_ORIGIN \
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((((unsigned long)&_end) + 511) & ~511)
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/* Round address to next higher page boundary. */
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#define NEXT_PAGE(a) (((a) | (PAGE_SIZE - 1)) + 1)
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#ifdef INITRD_IMAGE_SIZE
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# define REAL_INITRD_SIZE INITRD_IMAGE_SIZE
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#else
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# define REAL_INITRD_SIZE 0
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#endif
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/* Defines from include/asm-alpha/system.h
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BOOT_ADDR Virtual address at which the consoles loads
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the BOOTP image.
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KERNEL_START KSEG address at which the kernel is built to run,
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which includes some initial data pages before the
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code.
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START_ADDR KSEG address of the entry point of kernel code.
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ZERO_PGE KSEG address of page full of zeroes, but
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upon entry to kerne cvan be expected
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to hold the parameter list and possible
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INTRD information.
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These are used in the local defines below.
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*/
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/* Virtual addresses for the BOOTP image. Note that this includes the
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bootstrapper code as well as the compressed kernel image, and
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possibly the INITRD image.
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Oh, and do NOT forget the STACK, which appears to be placed virtually
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beyond the end of the loaded image.
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*/
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#define V_BOOT_IMAGE_START BOOT_ADDR
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#define V_BOOT_IMAGE_END SP_on_entry
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/* Virtual addresses for just the bootstrapper part of the BOOTP image. */
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#define V_BOOTSTRAPPER_START BOOT_ADDR
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#define V_BOOTSTRAPPER_END KERNEL_ORIGIN
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/* Virtual addresses for just the data part of the BOOTP
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image. This may also include the INITRD image, but always
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includes the STACK.
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*/
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#define V_DATA_START KERNEL_ORIGIN
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#define V_INITRD_START (KERNEL_ORIGIN + KERNEL_Z_SIZE)
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#define V_INTRD_END (V_INITRD_START + REAL_INITRD_SIZE)
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#define V_DATA_END V_BOOT_IMAGE_END
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/* KSEG addresses for the uncompressed kernel.
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Note that the end address includes workspace for the decompression.
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Note also that the DATA_START address is ZERO_PGE, to which we write
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just before jumping to the kernel image at START_ADDR.
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*/
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#define K_KERNEL_DATA_START ZERO_PGE
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#define K_KERNEL_IMAGE_START START_ADDR
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#define K_KERNEL_IMAGE_END (START_ADDR + KERNEL_SIZE)
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/* Define to where we may have to decompress the kernel image, before
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we move it to the final position, in case of overlap. This will be
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above the final position of the kernel.
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Regardless of overlap, we move the INITRD image to the end of this
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copy area, because there needs to be a buffer area after the kernel
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for "bootmem" anyway.
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*/
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#define K_COPY_IMAGE_START NEXT_PAGE(K_KERNEL_IMAGE_END)
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/* Reserve one page below INITRD for the new stack. */
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#define K_INITRD_START \
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NEXT_PAGE(K_COPY_IMAGE_START + KERNEL_SIZE + PAGE_SIZE)
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#define K_COPY_IMAGE_END \
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(K_INITRD_START + REAL_INITRD_SIZE + MALLOC_AREA_SIZE)
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#define K_COPY_IMAGE_SIZE \
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NEXT_PAGE(K_COPY_IMAGE_END - K_COPY_IMAGE_START)
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void
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start_kernel(void)
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{
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int must_move = 0;
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/* Initialize these for the decompression-in-place situation,
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which is the smallest amount of work and most likely to
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occur when using the normal START_ADDR of the kernel
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(currently set to 16MB, to clear all console code.
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*/
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unsigned long uncompressed_image_start = K_KERNEL_IMAGE_START;
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unsigned long uncompressed_image_end = K_KERNEL_IMAGE_END;
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unsigned long initrd_image_start = K_INITRD_START;
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/*
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* Note that this crufty stuff with static and envval
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* and envbuf is because:
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*
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* 1. Frequently, the stack is short, and we don't want to overrun;
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* 2. Frequently the stack is where we are going to copy the kernel to;
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* 3. A certain SRM console required the GET_ENV output to stack.
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* ??? A comment in the aboot sources indicates that the GET_ENV
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* destination must be quadword aligned. Might this explain the
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* behaviour, rather than requiring output to the stack, which
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* seems rather far-fetched.
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*/
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static long nbytes;
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static char envval[256] __attribute__((aligned(8)));
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register unsigned long asm_sp asm("30");
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SP_on_entry = asm_sp;
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srm_printk("Linux/Alpha BOOTPZ Loader for Linux " UTS_RELEASE "\n");
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/* Validity check the HWRPB. */
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if (INIT_HWRPB->pagesize != 8192) {
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srm_printk("Expected 8kB pages, got %ldkB\n",
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INIT_HWRPB->pagesize >> 10);
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return;
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}
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if (INIT_HWRPB->vptb != (unsigned long) VPTB) {
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srm_printk("Expected vptb at %p, got %p\n",
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VPTB, (void *)INIT_HWRPB->vptb);
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return;
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}
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/* PALcode (re)initialization. */
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pal_init();
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/* Get the parameter list from the console environment variable. */
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nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval));
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if (nbytes < 0 || nbytes >= sizeof(envval)) {
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nbytes = 0;
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}
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envval[nbytes] = '\0';
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#ifdef DEBUG_ADDRESSES
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srm_printk("START_ADDR 0x%lx\n", START_ADDR);
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srm_printk("KERNEL_ORIGIN 0x%lx\n", KERNEL_ORIGIN);
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srm_printk("KERNEL_SIZE 0x%x\n", KERNEL_SIZE);
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srm_printk("KERNEL_Z_SIZE 0x%x\n", KERNEL_Z_SIZE);
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#endif
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/* Since all the SRM consoles load the BOOTP image at virtual
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* 0x20000000, we have to ensure that the physical memory
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* pages occupied by that image do NOT overlap the physical
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* address range where the kernel wants to be run. This
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* causes real problems when attempting to cdecompress the
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* former into the latter... :-(
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*
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* So, we may have to decompress/move the kernel/INITRD image
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* virtual-to-physical someplace else first before moving
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* kernel /INITRD to their final resting places... ;-}
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*
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* Sigh...
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*/
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/* First, check to see if the range of addresses occupied by
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the bootstrapper part of the BOOTP image include any of the
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physical pages into which the kernel will be placed for
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execution.
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We only need check on the final kernel image range, since we
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will put the INITRD someplace that we can be sure is not
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in conflict.
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*/
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if (check_range(V_BOOTSTRAPPER_START, V_BOOTSTRAPPER_END,
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K_KERNEL_DATA_START, K_KERNEL_IMAGE_END))
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{
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srm_printk("FATAL ERROR: overlap of bootstrapper code\n");
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__halt();
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}
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/* Next, check to see if the range of addresses occupied by
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the compressed kernel/INITRD/stack portion of the BOOTP
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image include any of the physical pages into which the
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decompressed kernel or the INITRD will be placed for
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execution.
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*/
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if (check_range(V_DATA_START, V_DATA_END,
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K_KERNEL_IMAGE_START, K_COPY_IMAGE_END))
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{
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#ifdef DEBUG_ADDRESSES
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srm_printk("OVERLAP: cannot decompress in place\n");
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#endif
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uncompressed_image_start = K_COPY_IMAGE_START;
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uncompressed_image_end = K_COPY_IMAGE_END;
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must_move = 1;
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/* Finally, check to see if the range of addresses
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occupied by the compressed kernel/INITRD part of
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the BOOTP image include any of the physical pages
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into which that part is to be copied for
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decompression.
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*/
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while (check_range(V_DATA_START, V_DATA_END,
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uncompressed_image_start,
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uncompressed_image_end))
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{
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#if 0
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uncompressed_image_start += K_COPY_IMAGE_SIZE;
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uncompressed_image_end += K_COPY_IMAGE_SIZE;
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initrd_image_start += K_COPY_IMAGE_SIZE;
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#else
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/* Keep as close as possible to end of BOOTP image. */
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uncompressed_image_start += PAGE_SIZE;
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uncompressed_image_end += PAGE_SIZE;
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initrd_image_start += PAGE_SIZE;
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#endif
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}
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}
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srm_printk("Starting to load the kernel with args '%s'\n", envval);
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#ifdef DEBUG_ADDRESSES
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srm_printk("Decompressing the kernel...\n"
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"...from 0x%lx to 0x%lx size 0x%x\n",
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V_DATA_START,
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uncompressed_image_start,
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KERNEL_SIZE);
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#endif
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decompress_kernel((void *)uncompressed_image_start,
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(void *)V_DATA_START,
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KERNEL_SIZE, KERNEL_Z_SIZE);
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/*
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* Now, move things to their final positions, if/as required.
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*/
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#ifdef INITRD_IMAGE_SIZE
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/* First, we always move the INITRD image, if present. */
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#ifdef DEBUG_ADDRESSES
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srm_printk("Moving the INITRD image...\n"
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" from 0x%lx to 0x%lx size 0x%x\n",
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V_INITRD_START,
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initrd_image_start,
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INITRD_IMAGE_SIZE);
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#endif
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memcpy((void *)initrd_image_start, (void *)V_INITRD_START,
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INITRD_IMAGE_SIZE);
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#endif /* INITRD_IMAGE_SIZE */
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/* Next, we may have to move the uncompressed kernel to the
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final destination.
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*/
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if (must_move) {
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#ifdef DEBUG_ADDRESSES
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srm_printk("Moving the uncompressed kernel...\n"
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"...from 0x%lx to 0x%lx size 0x%x\n",
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uncompressed_image_start,
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K_KERNEL_IMAGE_START,
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(unsigned)KERNEL_SIZE);
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#endif
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/*
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* Move the stack to a safe place to ensure it won't be
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* overwritten by kernel image.
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*/
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move_stack(initrd_image_start - PAGE_SIZE);
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memcpy((void *)K_KERNEL_IMAGE_START,
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(void *)uncompressed_image_start, KERNEL_SIZE);
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}
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/* Clear the zero page, then move the argument list in. */
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#ifdef DEBUG_LAST_STEPS
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srm_printk("Preparing ZERO_PGE...\n");
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#endif
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memset((char*)ZERO_PGE, 0, PAGE_SIZE);
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strcpy((char*)ZERO_PGE, envval);
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#ifdef INITRD_IMAGE_SIZE
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#ifdef DEBUG_LAST_STEPS
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srm_printk("Preparing INITRD info...\n");
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#endif
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/* Finally, set the INITRD paramenters for the kernel. */
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((long *)(ZERO_PGE+256))[0] = initrd_image_start;
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((long *)(ZERO_PGE+256))[1] = INITRD_IMAGE_SIZE;
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#endif /* INITRD_IMAGE_SIZE */
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#ifdef DEBUG_LAST_STEPS
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srm_printk("Doing 'runkernel()'...\n");
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#endif
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runkernel();
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}
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/* dummy function, should never be called. */
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void *__kmalloc(size_t size, gfp_t flags)
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{
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return (void *)NULL;
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}
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