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124 lines
2.5 KiB
124 lines
2.5 KiB
20 years ago
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/*
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* relocate_kernel.S - put the kernel image in place to boot
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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*
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <asm/reg.h>
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#include <asm/ppc_asm.h>
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#include <asm/processor.h>
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#include <asm/kexec.h>
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#define PAGE_SIZE 4096 /* must be same value as in <asm/page.h> */
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/*
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* Must be relocatable PIC code callable as a C function.
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*/
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.globl relocate_new_kernel
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relocate_new_kernel:
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/* r3 = page_list */
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/* r4 = reboot_code_buffer */
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/* r5 = start_address */
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li r0, 0
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/*
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* Set Machine Status Register to a known status,
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* switch the MMU off and jump to 1: in a single step.
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*/
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mr r8, r0
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ori r8, r8, MSR_RI|MSR_ME
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mtspr SRR1, r8
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addi r8, r4, 1f - relocate_new_kernel
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mtspr SRR0, r8
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sync
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rfi
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1:
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/* from this point address translation is turned off */
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/* and interrupts are disabled */
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/* set a new stack at the bottom of our page... */
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/* (not really needed now) */
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addi r1, r4, KEXEC_CONTROL_CODE_SIZE - 8 /* for LR Save+Back Chain */
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stw r0, 0(r1)
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/* Do the copies */
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li r6, 0 /* checksum */
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mr r0, r3
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b 1f
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0: /* top, read another word for the indirection page */
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lwzu r0, 4(r3)
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1:
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/* is it a destination page? (r8) */
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rlwinm. r7, r0, 0, 31, 31 /* IND_DESTINATION (1<<0) */
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beq 2f
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rlwinm r8, r0, 0, 0, 19 /* clear kexec flags, page align */
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b 0b
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2: /* is it an indirection page? (r3) */
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rlwinm. r7, r0, 0, 30, 30 /* IND_INDIRECTION (1<<1) */
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beq 2f
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rlwinm r3, r0, 0, 0, 19 /* clear kexec flags, page align */
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subi r3, r3, 4
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b 0b
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2: /* are we done? */
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rlwinm. r7, r0, 0, 29, 29 /* IND_DONE (1<<2) */
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beq 2f
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b 3f
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2: /* is it a source page? (r9) */
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rlwinm. r7, r0, 0, 28, 28 /* IND_SOURCE (1<<3) */
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beq 0b
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rlwinm r9, r0, 0, 0, 19 /* clear kexec flags, page align */
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li r7, PAGE_SIZE / 4
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mtctr r7
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subi r9, r9, 4
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subi r8, r8, 4
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9:
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lwzu r0, 4(r9) /* do the copy */
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xor r6, r6, r0
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stwu r0, 4(r8)
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dcbst 0, r8
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sync
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icbi 0, r8
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bdnz 9b
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addi r9, r9, 4
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addi r8, r8, 4
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b 0b
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3:
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/* To be certain of avoiding problems with self-modifying code
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* execute a serializing instruction here.
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*/
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isync
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sync
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/* jump to the entry point, usually the setup routine */
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mtlr r5
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blrl
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1: b 1b
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relocate_new_kernel_end:
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.globl relocate_new_kernel_size
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relocate_new_kernel_size:
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.long relocate_new_kernel_end - relocate_new_kernel
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