diff options
Diffstat (limited to 'arch/ppc/boot/simple/relocate.S')
| -rw-r--r-- | arch/ppc/boot/simple/relocate.S | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/arch/ppc/boot/simple/relocate.S b/arch/ppc/boot/simple/relocate.S deleted file mode 100644 index 1bbbcd2..0000000 --- a/arch/ppc/boot/simple/relocate.S +++ /dev/null @@ -1,213 +0,0 @@ -/* - * 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 |
