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