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-rw-r--r--arch/ppc/boot/simple/relocate.S213
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diff --git a/arch/ppc/boot/simple/relocate.S b/arch/ppc/boot/simple/relocate.S
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-/*
- * This is the common part of the loader relocation and initialization
- * process. All of the board/processor specific initialization is
- * done before we get here.
- *
- * Author: Tom Rini
- * trini@mvista.com
- * Derived from arch/ppc/boot/prep/head.S (Cort Dougan, many others).
- *
- * 2001-2004 (c) MontaVista, Software, Inc. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
- */
-
-#include <asm/cache.h>
-#include <asm/ppc_asm.h>
-
-#define GETSYM(reg, sym) \
- lis reg, sym@h; ori reg, reg, sym@l
-
- .text
- /* We get called from the early initialization code.
- * Register 3 has the address where we were loaded,
- * Register 4 contains any residual data passed from the
- * boot rom.
- */
- .globl relocate
-relocate:
- /* Save r3, r4 for later.
- * The r8/r11 are legacy registers so I don't have to
- * rewrite the code below :-).
- */
- mr r8, r3
- mr r11, r4
-
- /* compute the size of the whole image in words. */
- GETSYM(r4,start)
- GETSYM(r5,end)
-
- addi r5,r5,3 /* round up */
- sub r5,r5,r4 /* end - start */
- srwi r5,r5,2
- mr r7,r5 /* Save for later use. */
-
- /*
- * Check if we need to relocate ourselves to the link addr or were
- * we loaded there to begin with.
- */
- cmpw cr0,r3,r4
- beq start_ldr /* If 0, we don't need to relocate */
-
- /* Move this code somewhere safe. This is max(load + size, end)
- * r8 == load address
- */
- GETSYM(r4, start)
- GETSYM(r5, end)
-
- sub r6,r5,r4
- add r6,r8,r6 /* r6 == phys(load + size) */
-
- cmpw r5,r6
- bgt 1f
- b 2f
-1:
- mr r6, r5
-2:
- /* dest is in r6 */
- /* Ensure alignment --- this code is precautionary */
- addi r6,r6,4
- li r5,0x0003
- andc r6,r6,r5
-
- /* Find physical address and size of do_relocate */
- GETSYM(r5, __relocate_start)
- GETSYM(r4, __relocate_end)
- GETSYM(r3, start)
-
- /* Size to copy */
- sub r4,r4,r5
- srwi r4,r4,2
-
- /* Src addr to copy (= __relocate_start - start + where_loaded) */
- sub r3,r5,r3
- add r5,r8,r3
-
- /* Save dest */
- mr r3, r6
-
- /* Do the copy */
- mtctr r4
-3: lwz r4,0(r5)
- stw r4,0(r3)
- addi r3,r3,4
- addi r5,r5,4
- bdnz 3b
-
- GETSYM(r4, __relocate_start)
- GETSYM(r5, do_relocate)
-
- sub r4,r5,r4 /* Get entry point for do_relocate in */
- add r6,r6,r4 /* relocated section */
-
- /* This will return to the relocated do_relocate */
- mtlr r6
- b flush_instruction_cache
-
- .section ".relocate_code","xa"
-
-do_relocate:
- /* We have 2 cases --- start < load, or start > load
- * This determines whether we copy from the end, or the start.
- * Its easier to have 2 loops than to have paramaterised
- * loops. Sigh.
- */
- li r6,0 /* Clear checksum */
- mtctr r7 /* Setup for a loop */
-
- GETSYM(r4, start)
- mr r3,r8 /* Get the load addr */
-
- cmpw cr0,r4,r3 /* If we need to copy from the end, do so */
- bgt do_relocate_from_end
-
-do_relocate_from_start:
-1: lwz r5,0(r3) /* Load and decrement */
- stw r5,0(r4) /* Store and decrement */
- addi r3,r3,4
- addi r4,r4,4
- xor r6,r6,r5 /* Update checksum */
- bdnz 1b /* Are we done? */
- b do_relocate_out /* Finished */
-
-do_relocate_from_end:
- GETSYM(r3, end)
- slwi r4,r7,2
- add r4,r8,r4 /* Get the physical end */
-1: lwzu r5,-4(r4)
- stwu r5, -4(r3)
- xor r6,r6,r5
- bdnz 1b
-
-do_relocate_out:
- GETSYM(r3,start_ldr)
- mtlr r3 /* Easiest way to do an absolute jump */
-/* Some boards don't boot up with the I-cache enabled. Do that
- * now because the decompress runs much faster that way.
- * As a side effect, we have to ensure the data cache is not enabled
- * so we can access the serial I/O without trouble.
- */
- b flush_instruction_cache
-
- .previous
-
-start_ldr:
-/* Clear all of BSS and set up stack for C calls */
- lis r3,__bss_start@h
- ori r3,r3,__bss_start@l
- lis r4,end@h
- ori r4,r4,end@l
- subi r3,r3,4
- subi r4,r4,4
- li r0,0
-50: stwu r0,4(r3)
- cmpw cr0,r3,r4
- blt 50b
-90: mr r9,r1 /* Save old stack pointer (in case it matters) */
- lis r1,.stack@h
- ori r1,r1,.stack@l
- addi r1,r1,4096*2
- subi r1,r1,256
- li r2,0x000F /* Mask pointer to 16-byte boundary */
- andc r1,r1,r2
-
- /*
- * Exec kernel loader
- */
- mr r3,r8 /* Load point */
- mr r4,r7 /* Program length */
- mr r5,r6 /* Checksum */
- mr r6,r11 /* Residual data */
- mr r7,r25 /* Validated OFW interface */
- bl load_kernel
-
- /*
- * Make sure the kernel knows we don't have things set in
- * registers. -- Tom
- */
- li r4,0
- li r5,0
- li r6,0
-
- /*
- * Start at the begining.
- */
-#ifdef CONFIG_PPC_PREP
- li r9,0xc
- mtlr r9
- /* tell kernel we're prep, by putting 0xdeadc0de at KERNELLOAD,
- * and tell the kernel to start on the 4th instruction since we
- * overwrite the first 3 sometimes (which are 'nop').
- */
- lis r10,0xdeadc0de@h
- ori r10,r10,0xdeadc0de@l
- li r9,0
- stw r10,0(r9)
-#else
- li r9,0
- mtlr r9
-#endif
- blr
-
- .comm .stack,4096*2,4
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