diff options
Diffstat (limited to 'arch/mips/cpu/xburst/start.S')
| -rw-r--r-- | arch/mips/cpu/xburst/start.S | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/arch/mips/cpu/xburst/start.S b/arch/mips/cpu/xburst/start.S deleted file mode 100644 index 10dffb4..0000000 --- a/arch/mips/cpu/xburst/start.S +++ /dev/null @@ -1,179 +0,0 @@ -/* - * Startup Code for MIPS32 XBURST CPU-core - * - * Copyright (c) 2010 Xiangfu Liu <xiangfu@sharism.cc> - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <config.h> -#include <version.h> -#include <asm/regdef.h> -#include <asm/mipsregs.h> -#include <asm/addrspace.h> -#include <asm/cacheops.h> - - .set noreorder - - .globl _start - .text -_start: - /* Initialize $gp */ - bal 1f - nop - .word _gp -1: - lw gp, 0(ra) - - /* Set up temporary stack */ - li sp, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET - - la t9, board_init_f - jr t9 - nop - -/* - * void relocate_code (addr_sp, gd, addr_moni) - * - * This "function" does not return, instead it continues in RAM - * after relocating the monitor code. - * - * a0 = addr_sp - * a1 = gd - * a2 = destination address - */ - .globl relocate_code - .ent relocate_code -relocate_code: - move sp, a0 # set new stack pointer - - move s0, a1 # save gd in s0 - move s2, a2 # save destination address in s2 - - li t0, CONFIG_SYS_MONITOR_BASE - sub s1, s2, t0 # s1 <-- relocation offset - - la t3, in_ram - lw t2, -12(t3) # t2 <-- __image_copy_end - move t1, a2 - - add gp, s1 # adjust gp - - /* - * t0 = source address - * t1 = target address - * t2 = source end address - */ -1: - lw t3, 0(t0) - sw t3, 0(t1) - addu t0, 4 - blt t0, t2, 1b - addu t1, 4 - - /* If caches were enabled, we would have to flush them here. */ - - /* flush d-cache */ - li t0, KSEG0 - addi t1, t0, CONFIG_SYS_DCACHE_SIZE -2: - cache INDEX_WRITEBACK_INV_D, 0(t0) - bne t0, t1, 2b - addi t0, CONFIG_SYS_CACHELINE_SIZE - - sync - - /* flush i-cache */ - li t0, KSEG0 - addi t1, t0, CONFIG_SYS_ICACHE_SIZE -3: - cache INDEX_INVALIDATE_I, 0(t0) - bne t0, t1, 3b - addi t0, CONFIG_SYS_CACHELINE_SIZE - - /* Invalidate BTB */ - mfc0 t0, CP0_CONFIG, 7 - nop - ori t0, 2 - mtc0 t0, CP0_CONFIG, 7 - nop - - /* Jump to where we've relocated ourselves */ - addi t0, s2, in_ram - _start - jr t0 - nop - - .word __rel_dyn_end - .word __rel_dyn_start - .word __image_copy_end - .word _GLOBAL_OFFSET_TABLE_ - .word num_got_entries - -in_ram: - /* - * Now we want to update GOT. - * - * GOT[0] is reserved. GOT[1] is also reserved for the dynamic object - * generated by GNU ld. Skip these reserved entries from relocation. - */ - lw t3, -4(t0) # t3 <-- num_got_entries - lw t8, -8(t0) # t8 <-- _GLOBAL_OFFSET_TABLE_ - add t8, s1 # t8 now holds relocated _G_O_T_ - addi t8, t8, 8 # skipping first two entries - li t2, 2 -1: - lw t1, 0(t8) - beqz t1, 2f - add t1, s1 - sw t1, 0(t8) -2: - addi t2, 1 - blt t2, t3, 1b - addi t8, 4 - - /* Update dynamic relocations */ - lw t1, -16(t0) # t1 <-- __rel_dyn_start - lw t2, -20(t0) # t2 <-- __rel_dyn_end - - b 2f # skip first reserved entry - addi t1, 8 - -1: - lw t8, -4(t1) # t8 <-- relocation info - - li t3, 3 - bne t8, t3, 2f # skip non R_MIPS_REL32 entries - nop - - lw t3, -8(t1) # t3 <-- location to fix up in FLASH - - lw t8, 0(t3) # t8 <-- original pointer - add t8, s1 # t8 <-- adjusted pointer - - add t3, s1 # t3 <-- location to fix up in RAM - sw t8, 0(t3) - -2: - blt t1, t2, 1b - addi t1, 8 # each rel.dyn entry is 8 bytes - - /* - * Clear BSS - * - * GOT is now relocated. Thus __bss_start and __bss_end can be - * accessed directly via $gp. - */ - la t1, __bss_start # t1 <-- __bss_start - la t2, __bss_end # t2 <-- __bss_end - -1: - sw zero, 0(t1) - blt t1, t2, 1b - addi t1, 4 - - move a0, s0 # a0 <-- gd - la t9, board_init_r - jr t9 - move a1, s2 - - .end relocate_code |