| /* |
| * Startup Code for MIPS32 CPU-core |
| * |
| * Copyright (c) 2003 Wolfgang Denk <wd@denx.de> |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <config.h> |
| #include <version.h> |
| #include <asm/regdef.h> |
| #include <asm/mipsregs.h> |
| |
| /* |
| * 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 |
| |
| .macro setup_c0_status_reset |
| #ifdef CONFIG_64BIT |
| setup_c0_status ST0_KX 0 |
| #else |
| setup_c0_status 0 0 |
| #endif |
| .endm |
| |
| #define RVECENT(f,n) \ |
| b f; nop |
| #define XVECENT(f,bev) \ |
| b f ; \ |
| li k0,bev |
| |
| .set noreorder |
| |
| .globl _start |
| .text |
| _start: |
| RVECENT(reset,0) /* U-boot entry point */ |
| RVECENT(reset,1) /* software reboot */ |
| #if defined(CONFIG_INCA_IP) |
| .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */ |
| .word 0x00000000 /* phase of the flash */ |
| #elif defined(CONFIG_PURPLE) |
| .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */ |
| .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */ |
| #else |
| RVECENT(romReserved,2) |
| #endif |
| RVECENT(romReserved,3) |
| RVECENT(romReserved,4) |
| RVECENT(romReserved,5) |
| RVECENT(romReserved,6) |
| RVECENT(romReserved,7) |
| RVECENT(romReserved,8) |
| RVECENT(romReserved,9) |
| RVECENT(romReserved,10) |
| RVECENT(romReserved,11) |
| RVECENT(romReserved,12) |
| RVECENT(romReserved,13) |
| RVECENT(romReserved,14) |
| RVECENT(romReserved,15) |
| RVECENT(romReserved,16) |
| RVECENT(romReserved,17) |
| RVECENT(romReserved,18) |
| RVECENT(romReserved,19) |
| RVECENT(romReserved,20) |
| RVECENT(romReserved,21) |
| RVECENT(romReserved,22) |
| RVECENT(romReserved,23) |
| RVECENT(romReserved,24) |
| RVECENT(romReserved,25) |
| RVECENT(romReserved,26) |
| RVECENT(romReserved,27) |
| RVECENT(romReserved,28) |
| RVECENT(romReserved,29) |
| RVECENT(romReserved,30) |
| RVECENT(romReserved,31) |
| RVECENT(romReserved,32) |
| RVECENT(romReserved,33) |
| RVECENT(romReserved,34) |
| RVECENT(romReserved,35) |
| RVECENT(romReserved,36) |
| RVECENT(romReserved,37) |
| RVECENT(romReserved,38) |
| RVECENT(romReserved,39) |
| RVECENT(romReserved,40) |
| RVECENT(romReserved,41) |
| RVECENT(romReserved,42) |
| RVECENT(romReserved,43) |
| RVECENT(romReserved,44) |
| RVECENT(romReserved,45) |
| RVECENT(romReserved,46) |
| RVECENT(romReserved,47) |
| RVECENT(romReserved,48) |
| RVECENT(romReserved,49) |
| RVECENT(romReserved,50) |
| RVECENT(romReserved,51) |
| RVECENT(romReserved,52) |
| RVECENT(romReserved,53) |
| RVECENT(romReserved,54) |
| RVECENT(romReserved,55) |
| RVECENT(romReserved,56) |
| RVECENT(romReserved,57) |
| RVECENT(romReserved,58) |
| RVECENT(romReserved,59) |
| RVECENT(romReserved,60) |
| RVECENT(romReserved,61) |
| RVECENT(romReserved,62) |
| RVECENT(romReserved,63) |
| XVECENT(romExcHandle,0x200) /* bfc00200: R4000 tlbmiss vector */ |
| RVECENT(romReserved,65) |
| RVECENT(romReserved,66) |
| RVECENT(romReserved,67) |
| RVECENT(romReserved,68) |
| RVECENT(romReserved,69) |
| RVECENT(romReserved,70) |
| RVECENT(romReserved,71) |
| RVECENT(romReserved,72) |
| RVECENT(romReserved,73) |
| RVECENT(romReserved,74) |
| RVECENT(romReserved,75) |
| RVECENT(romReserved,76) |
| RVECENT(romReserved,77) |
| RVECENT(romReserved,78) |
| RVECENT(romReserved,79) |
| XVECENT(romExcHandle,0x280) /* bfc00280: R4000 xtlbmiss vector */ |
| RVECENT(romReserved,81) |
| RVECENT(romReserved,82) |
| RVECENT(romReserved,83) |
| RVECENT(romReserved,84) |
| RVECENT(romReserved,85) |
| RVECENT(romReserved,86) |
| RVECENT(romReserved,87) |
| RVECENT(romReserved,88) |
| RVECENT(romReserved,89) |
| RVECENT(romReserved,90) |
| RVECENT(romReserved,91) |
| RVECENT(romReserved,92) |
| RVECENT(romReserved,93) |
| RVECENT(romReserved,94) |
| RVECENT(romReserved,95) |
| XVECENT(romExcHandle,0x300) /* bfc00300: R4000 cache vector */ |
| RVECENT(romReserved,97) |
| RVECENT(romReserved,98) |
| RVECENT(romReserved,99) |
| RVECENT(romReserved,100) |
| RVECENT(romReserved,101) |
| RVECENT(romReserved,102) |
| RVECENT(romReserved,103) |
| RVECENT(romReserved,104) |
| RVECENT(romReserved,105) |
| RVECENT(romReserved,106) |
| RVECENT(romReserved,107) |
| RVECENT(romReserved,108) |
| RVECENT(romReserved,109) |
| RVECENT(romReserved,110) |
| RVECENT(romReserved,111) |
| XVECENT(romExcHandle,0x380) /* bfc00380: R4000 general vector */ |
| RVECENT(romReserved,113) |
| RVECENT(romReserved,114) |
| RVECENT(romReserved,115) |
| RVECENT(romReserved,116) |
| RVECENT(romReserved,116) |
| RVECENT(romReserved,118) |
| RVECENT(romReserved,119) |
| RVECENT(romReserved,120) |
| RVECENT(romReserved,121) |
| RVECENT(romReserved,122) |
| RVECENT(romReserved,123) |
| RVECENT(romReserved,124) |
| RVECENT(romReserved,125) |
| RVECENT(romReserved,126) |
| RVECENT(romReserved,127) |
| |
| /* We hope there are no more reserved vectors! |
| * 128 * 8 == 1024 == 0x400 |
| * so this is address R_VEC+0x400 == 0xbfc00400 |
| */ |
| #ifdef CONFIG_PURPLE |
| /* 0xbfc00400 */ |
| .word 0xdc870000 |
| .word 0xfca70000 |
| .word 0x20840008 |
| .word 0x20a50008 |
| .word 0x20c6ffff |
| .word 0x14c0fffa |
| .word 0x00000000 |
| .word 0x03e00008 |
| .word 0x00000000 |
| .word 0x00000000 |
| /* 0xbfc00428 */ |
| .word 0xdc870000 |
| .word 0xfca70000 |
| .word 0x20840008 |
| .word 0x20a50008 |
| .word 0x20c6ffff |
| .word 0x14c0fffa |
| .word 0x00000000 |
| .word 0x03e00008 |
| .word 0x00000000 |
| .word 0x00000000 |
| #endif /* CONFIG_PURPLE */ |
| .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_reset |
| |
| /* Init Timer */ |
| mtc0 zero, CP0_COUNT |
| mtc0 zero, CP0_COMPARE |
| |
| /* CONFIG0 register */ |
| li t0, CONF_CM_UNCACHED |
| mtc0 t0, CP0_CONFIG |
| |
| /* Initialize $gp. |
| */ |
| bal 1f |
| nop |
| .word _gp |
| 1: |
| lw gp, 0(ra) |
| |
| /* 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, CONF_CM_CACHABLE_NONCOHERENT |
| mtc0 t0, CP0_CONFIG |
| |
| /* Set up temporary stack. |
| */ |
| #ifdef CFG_INIT_RAM_LOCK_MIPS |
| li a0, CFG_INIT_SP_OFFSET |
| la t9, mips_cache_lock |
| jalr t9 |
| nop |
| #endif |
| |
| li t0, CFG_SDRAM_BASE + CFG_INIT_SP_OFFSET |
| la sp, 0(t0) |
| |
| 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 */ |
| |
| li t0, CFG_MONITOR_BASE |
| la t3, in_ram |
| lw t2, -12(t3) /* t2 <-- uboot_end_data */ |
| move t1, a2 |
| |
| /* |
| * Fix $gp: |
| * |
| * New $gp = (Old $gp - CFG_MONITOR_BASE) + Destination Address |
| */ |
| move t6, gp |
| sub gp, CFG_MONITOR_BASE |
| add gp, a2 /* gp now adjusted */ |
| sub t6, gp, t6 /* t6 <-- relocation offset */ |
| |
| /* |
| * t0 = source address |
| * t1 = target address |
| * t2 = source end address |
| */ |
| /* On the purple board we copy the code earlier in a special way |
| * in order to solve flash problems |
| */ |
| #ifndef CONFIG_PURPLE |
| 1: |
| lw t3, 0(t0) |
| sw t3, 0(t1) |
| addu t0, 4 |
| ble t0, t2, 1b |
| addu t1, 4 /* delay slot */ |
| #endif |
| |
| /* If caches were enabled, we would have to flush them here. |
| */ |
| |
| /* Jump to where we've relocated ourselves. |
| */ |
| addi t0, a2, in_ram - _start |
| jr t0 |
| nop |
| |
| .word _gp |
| .word _GLOBAL_OFFSET_TABLE_ |
| .word uboot_end_data |
| .word uboot_end |
| .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 t4, -16(t0) /* t4 <-- _GLOBAL_OFFSET_TABLE_ */ |
| lw t5, -20(t0) /* t5 <-- _gp */ |
| sub t4, t5 /* compute offset*/ |
| add t4, t4, gp /* t4 now holds relocated _GLOBAL_OFFSET_TABLE_ */ |
| addi t4, t4, 8 /* Skipping first two entries. */ |
| li t2, 2 |
| 1: |
| lw t1, 0(t4) |
| beqz t1, 2f |
| add t1, t6 |
| sw t1, 0(t4) |
| 2: |
| addi t2, 1 |
| blt t2, t3, 1b |
| addi t4, 4 /* delay slot */ |
| |
| /* Clear BSS. |
| */ |
| lw t1, -12(t0) /* t1 <-- uboot_end_data */ |
| lw t2, -8(t0) /* t2 <-- uboot_end */ |
| add t1, t6 /* adjust pointers */ |
| add t2, t6 |
| |
| sub t1, 4 |
| 1: |
| addi t1, 4 |
| bltl t1, t2, 1b |
| sw zero, 0(t1) /* delay slot */ |
| |
| move a0, a1 |
| la t9, board_init_r |
| jr t9 |
| move a1, a2 /* delay slot */ |
| |
| .end relocate_code |
| |
| /* Exception handlers. |
| */ |
| romReserved: |
| b romReserved |
| |
| romExcHandle: |
| b romExcHandle |