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https://github.com/FEX-Emu/linux.git
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103 lines
1.7 KiB
ArmAsm
103 lines
1.7 KiB
ArmAsm
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/*
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* relocate_kernel.S - put the kernel image in place to boot
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* 2005.9.17 kogiidena@eggplant.ddo.jp
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*
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* LANDISK/sh4 is supported. Maybe, SH archtecture works well.
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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 <linux/config.h>
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#include <linux/linkage.h>
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#define PAGE_SIZE 4096 /* must be same value as in <asm/page.h> */
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.globl relocate_new_kernel
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relocate_new_kernel:
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/* r4 = indirection_page */
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/* r5 = reboot_code_buffer */
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/* r6 = start_address */
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/* r7 = vbr_reg */
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mov.l 10f,r8 /* 4096 */
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mov.l 11f,r9 /* 0xa0000000 */
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/* stack setting */
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add r8,r5
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mov r5,r15
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bra 1f
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mov r4,r0 /* cmd = indirection_page */
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0:
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mov.l @r4+,r0 /* cmd = *ind++ */
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1: /* addr = (cmd | 0xa0000000) & 0xfffffff0 */
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mov r0,r2
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or r9,r2
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mov #-16,r1
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and r1,r2
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/* if(cmd & IND_DESTINATION) dst = addr */
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tst #1,r0
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bt 2f
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bra 0b
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mov r2,r5
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2: /* else if(cmd & IND_INDIRECTION) ind = addr */
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tst #2,r0
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bt 3f
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bra 0b
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mov r2,r4
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3: /* else if(cmd & IND_DONE) goto 6 */
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tst #4,r0
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bt 4f
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bra 6f
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nop
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4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */
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tst #8,r0
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bt 0b
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mov r8,r3
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shlr2 r3
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shlr2 r3
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5:
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dt r3
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mov.l @r2+,r1 /* 16n+0 */
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mov.l r1,@r5
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add #4,r5
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mov.l @r2+,r1 /* 16n+4 */
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mov.l r1,@r5
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add #4,r5
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mov.l @r2+,r1 /* 16n+8 */
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mov.l r1,@r5
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add #4,r5
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mov.l @r2+,r1 /* 16n+12 */
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mov.l r1,@r5
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add #4,r5
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bf 5b
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bra 0b
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nop
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6:
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#ifdef CONFIG_SH_STANDARD_BIOS
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ldc r7, vbr
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#endif
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jmp @r6
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nop
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.align 2
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10:
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.long PAGE_SIZE
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11:
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.long 0xa0000000
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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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