diff options
Diffstat (limited to 'qemu/roms/u-boot/arch/mips/cpu/mips32/start.S')
| -rw-r--r-- | qemu/roms/u-boot/arch/mips/cpu/mips32/start.S | 267 |
1 files changed, 0 insertions, 267 deletions
diff --git a/qemu/roms/u-boot/arch/mips/cpu/mips32/start.S b/qemu/roms/u-boot/arch/mips/cpu/mips32/start.S deleted file mode 100644 index 68e59b596..000000000 --- a/qemu/roms/u-boot/arch/mips/cpu/mips32/start.S +++ /dev/null @@ -1,267 +0,0 @@ -/* - * Startup Code for MIPS32 CPU-core - * - * Copyright (c) 2003 Wolfgang Denk <wd@denx.de> - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <asm-offsets.h> -#include <config.h> -#include <asm/regdef.h> -#include <asm/mipsregs.h> - -#ifndef CONFIG_SYS_MIPS_CACHE_MODE -#define CONFIG_SYS_MIPS_CACHE_MODE CONF_CM_CACHABLE_NONCOHERENT -#endif - - /* - * For the moment disable interrupts, mark the kernel mode and - * set ST0_KX so that the CPU does not spit fire when using - * 64-bit addresses. - */ - .macro setup_c0_status set clr - .set push - mfc0 t0, CP0_STATUS - or t0, ST0_CU0 | \set | 0x1f | \clr - xor t0, 0x1f | \clr - mtc0 t0, CP0_STATUS - .set noreorder - sll zero, 3 # ehb - .set pop - .endm - - .set noreorder - - .globl _start - .text -_start: - /* U-boot entry point */ - b reset - nop - - .org 0x10 -#if defined(CONFIG_SYS_XWAY_EBU_BOOTCFG) - /* - * Almost all Lantiq XWAY SoC devices have an external bus unit (EBU) to - * access external NOR flashes. If the board boots from NOR flash the - * internal BootROM does a blind read at address 0xB0000010 to read the - * initial configuration for that EBU in order to access the flash - * device with correct parameters. This config option is board-specific. - */ - .word CONFIG_SYS_XWAY_EBU_BOOTCFG - .word 0x0 -#elif defined(CONFIG_MALTA) - /* - * Linux expects the Board ID here. - */ - .word 0x00000420 # 0x420 (Malta Board with CoreLV) - .word 0x00000000 -#endif - - .org 0x200 - /* TLB refill, 32 bit task */ -1: b 1b - nop - - .org 0x280 - /* XTLB refill, 64 bit task */ -1: b 1b - nop - - .org 0x300 - /* Cache error exception */ -1: b 1b - nop - - .org 0x380 - /* General exception */ -1: b 1b - nop - - .org 0x400 - /* Catch interrupt exceptions */ -1: b 1b - nop - - .org 0x480 - /* EJTAG debug exception */ -1: b 1b - nop - - .align 4 -reset: - - /* Clear watch registers */ - mtc0 zero, CP0_WATCHLO - mtc0 zero, CP0_WATCHHI - - /* WP(Watch Pending), SW0/1 should be cleared */ - mtc0 zero, CP0_CAUSE - - setup_c0_status 0 0 - - /* Init Timer */ - mtc0 zero, CP0_COUNT - mtc0 zero, CP0_COMPARE - -#ifndef CONFIG_SKIP_LOWLEVEL_INIT - /* CONFIG0 register */ - li t0, CONF_CM_UNCACHED - mtc0 t0, CP0_CONFIG -#endif - - /* Initialize $gp */ - bal 1f - nop - .word _gp -1: - lw gp, 0(ra) - -#ifndef CONFIG_SKIP_LOWLEVEL_INIT - /* Initialize any external memory */ - la t9, lowlevel_init - jalr t9 - nop - - /* Initialize caches... */ - la t9, mips_cache_reset - jalr t9 - nop - - /* ... and enable them */ - li t0, CONFIG_SYS_MIPS_CACHE_MODE - mtc0 t0, CP0_CONFIG -#endif - - /* 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. */ - sub a1, t1, s2 # a1 <-- size - la t9, flush_cache - jalr t9 - move a0, s2 # a0 <-- destination address - - /* 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 |