diff options
Diffstat (limited to 'arch/microblaze/cpu')
| -rw-r--r-- | arch/microblaze/cpu/start.S | 209 |
1 files changed, 108 insertions, 101 deletions
diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S index cbec299b7d..9479737aa2 100644 --- a/arch/microblaze/cpu/start.S +++ b/arch/microblaze/cpu/start.S @@ -13,31 +13,108 @@ .text .global _start _start: - /* - * reserve registers: - * r10: Stores little/big endian offset for vectors - * r2: Stores imm opcode - * r3: Stores brai opcode - */ - mts rmsr, r0 /* disable cache */ addi r8, r0, __end mts rslr, r8 - /* TODO: Redo this code to call board_init_f_*() */ + #if defined(CONFIG_SPL_BUILD) addi r1, r0, CONFIG_SPL_STACK_ADDR - mts rshr, r1 - addi r1, r1, -4 /* Decrement SP to top of memory */ -#else -#if CONFIG_VAL(SYS_MALLOC_F_LEN) - addi r1, r0, CONFIG_SYS_INIT_SP_OFFSET - CONFIG_VAL(SYS_MALLOC_F_LEN) #else addi r1, r0, CONFIG_SYS_INIT_SP_OFFSET #endif - mts rshr, r1 + addi r1, r1, -4 /* Decrement SP to top of memory */ + /* Call board_init_f_alloc_reserve with the current stack pointer as + * parameter. */ + add r5, r0, r1 + bralid r15, board_init_f_alloc_reserve + nop + + /* board_init_f_alloc_reserve returns a pointer to the allocated area + * in r3. Set the new stack pointer below this area. */ + add r1, r0, r3 + mts rshr, r1 + addi r1, r1, -4 + + /* Call board_init_f_init_reserve with the address returned by + * board_init_f_alloc_reserve as parameter. */ + add r5, r0, r3 + bralid r15, board_init_f_init_reserve + nop + +#if !defined(CONFIG_SPL_BUILD) + /* Setup vectors with pre-relocation symbols */ + or r5, r0, r0 + bralid r15, __setup_exceptions + nop +#endif + + /* Flush cache before enable cache */ + addik r5, r0, 0 + addik r6, r0, XILINX_DCACHE_BYTE_SIZE + bralid r15, flush_cache + nop + + /* enable instruction and data cache */ + mfs r12, rmsr + ori r12, r12, 0x1a0 + mts rmsr, r12 + +clear_bss: + /* clear BSS segments */ + addi r5, r0, __bss_start + addi r4, r0, __bss_end + cmp r6, r5, r4 + beqi r6, 3f +2: + swi r0, r5, 0 /* write zero to loc */ + addi r5, r5, 4 /* increment to next loc */ + cmp r6, r5, r4 /* check if we have reach the end */ + bnei r6, 2b +3: /* jumping to board_init */ +#ifdef CONFIG_DEBUG_UART + bralid r15, debug_uart_init + nop +#endif +#ifndef CONFIG_SPL_BUILD + or r5, r0, r0 /* flags - empty */ + brai board_init_f +#else + brai board_init_r +#endif +1: bri 1b + +#ifndef CONFIG_SPL_BUILD + .text + .ent __setup_exceptions + .align 2 +/* + * Set up reset, interrupt, user exception and hardware exception vectors. + * + * Parameters: + * r5 - relocation offset (zero when setting up vectors before + * relocation, and gd->reloc_off when setting up vectors after + * relocation) + * - the relocation offset is added to the _exception_handler, + * _interrupt_handler and _hw_exception_handler symbols to reflect the + * post-relocation memory addresses + * + * Reserve registers: + * r10: Stores little/big endian offset for vectors + * r2: Stores imm opcode + * r3: Stores brai opcode + */ +__setup_exceptions: + addik r1, r1, -28 + swi r2, r1, 4 + swi r3, r1, 8 + swi r6, r1, 12 + swi r7, r1, 16 + swi r8, r1, 20 + swi r10, r1, 24 + /* Find-out if u-boot is running on BIG/LITTLE endian platform * There are some steps which is necessary to keep in mind: * 1. Setup offset value to r6 @@ -76,7 +153,7 @@ _start: swi r2, r0, 0x8 /* user vector exception - imm opcode */ swi r3, r0, 0xC /* user vector exception - brai opcode */ - addik r6, r0, _exception_handler + addik r6, r5, _exception_handler sw r6, r1, r0 /* * BIG ENDIAN memory map for user exception @@ -109,7 +186,7 @@ _start: swi r2, r0, 0x10 /* interrupt - imm opcode */ swi r3, r0, 0x14 /* interrupt - brai opcode */ - addik r6, r0, _interrupt_handler + addik r6, r5, _interrupt_handler sw r6, r1, r0 lhu r7, r1, r10 rsubi r8, r10, 0x12 @@ -121,67 +198,26 @@ _start: swi r2, r0, 0x20 /* hardware exception - imm opcode */ swi r3, r0, 0x24 /* hardware exception - brai opcode */ - addik r6, r0, _hw_exception_handler + addik r6, r5, _hw_exception_handler sw r6, r1, r0 lhu r7, r1, r10 rsubi r8, r10, 0x22 sh r7, r0, r8 rsubi r8, r10, 0x26 sh r6, r0, r8 -#endif /* CONFIG_SPL_BUILD */ - - /* Flush cache before enable cache */ - addik r5, r0, 0 - addik r6, r0, XILINX_DCACHE_BYTE_SIZE - bralid r15, flush_cache - nop - - /* enable instruction and data cache */ - mfs r12, rmsr - ori r12, r12, 0x1a0 - mts rmsr, r12 - /* TODO: Redo this code to call board_init_f_*() */ -clear_bss: - /* clear BSS segments */ - addi r5, r0, __bss_start - addi r4, r0, __bss_end - cmp r6, r5, r4 - beqi r6, 3f -2: - swi r0, r5, 0 /* write zero to loc */ - addi r5, r5, 4 /* increment to next loc */ - cmp r6, r5, r4 /* check if we have reach the end */ - bnei r6, 2b -3: /* jumping to board_init */ -#ifdef CONFIG_DEBUG_UART - bralid r15, debug_uart_init - nop -#endif -#ifndef CONFIG_SPL_BUILD - or r5, r0, r0 /* flags - empty */ - addi r31, r0, _gd -#if CONFIG_VAL(SYS_MALLOC_F_LEN) - addi r6, r0, CONFIG_SYS_INIT_SP_OFFSET - swi r6, r31, GD_MALLOC_BASE -#endif - brai board_init_f -#else - addi r31, r0, _gd -#if CONFIG_VAL(SYS_MALLOC_F_LEN) - addi r6, r0, CONFIG_SPL_STACK_ADDR - swi r6, r31, GD_MALLOC_BASE -#endif - brai board_init_r -#endif -1: bri 1b + lwi r10, r1, 24 + lwi r8, r1, 20 + lwi r7, r1, 16 + lwi r6, r1, 12 + lwi r3, r1, 8 + lwi r2, r1, 4 + addik r1, r1, 28 - .section .bss -.align 4 -_gd: - .space GENERATED_GBL_DATA_SIZE + rtsd r15, 8 + or r0, r0, r0 + .end __setup_exceptions -#ifndef CONFIG_SPL_BUILD /* * Read 16bit little endian */ @@ -249,39 +285,10 @@ relocate_code: addi r24, r0, CONFIG_SYS_TEXT_BASE /* Get reloc offset */ rsub r23, r24, r23 /* keep - this is already here gd->reloc_off */ - addik r6, r0, 0x2 /* BIG/LITTLE endian offset */ - lwi r7, r0, 0x28 - swi r6, r0, 0x28 /* used first unused MB vector */ - lbui r10, r0, 0x28 /* used first unused MB vector */ - swi r7, r0, 0x28 - -#ifdef CONFIG_SYS_USR_EXCEP - addik r6, r0, _exception_handler - addk r6, r6, r23 /* add offset */ - sw r6, r1, r0 - lhu r7, r1, r10 - rsubi r8, r10, 0xa - sh r7, r0, r8 - rsubi r8, r10, 0xe - sh r6, r0, r8 -#endif - addik r6, r0, _hw_exception_handler - addk r6, r6, r23 /* add offset */ - sw r6, r1, r0 - lhu r7, r1, r10 - rsubi r8, r10, 0x22 - sh r7, r0, r8 - rsubi r8, r10, 0x26 - sh r6, r0, r8 - - addik r6, r0, _interrupt_handler - addk r6, r6, r23 /* add offset */ - sw r6, r1, r0 - lhu r7, r1, r10 - rsubi r8, r10, 0x12 - sh r7, r0, r8 - rsubi r8, r10, 0x16 - sh r6, r0, r8 + /* Setup vectors with post-relocation symbols */ + add r5, r0, r23 /* load gd->reloc_off to r5 */ + bralid r15, __setup_exceptions + nop /* Check if GOT exist */ addik r21, r23, _got_start |