diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/start/start.S | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/start/start.S b/c/src/lib/libbsp/powerpc/shared/start/start.S deleted file mode 100644 index 354b9a967e..0000000000 --- a/c/src/lib/libbsp/powerpc/shared/start/start.S +++ /dev/null @@ -1,207 +0,0 @@ -/* - * start.S : RTEMS entry point - * - * Copyright (C) 1999 Eric Valette. valette@crf.canon.fr - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - * - */ - -#include <rtems/asm.h> -#include <rtems/score/cpu.h> -#include <rtems/powerpc/powerpc.h> - -#include <libcpu/io.h> -#include <libcpu/bat.h> -#include <bspopts.h> - -#define SYNC \ - sync; \ - isync - -#define KERNELBASE 0x0 - -#define MONITOR_ENTER \ - mfmsr r10 ; \ - ori r10,r10,MSR_IP ; \ - mtmsr r10 ; \ - li r10,0x63 ; \ - sc - - .text - .globl __rtems_entry_point - .type __rtems_entry_point,@function -__rtems_entry_point: -#ifdef DEBUG_EARLY_START - MONITOR_ENTER -#endif - -/* - * PREP - * This is jumped to on prep systems right after the kernel is relocated - * to its proper place in memory by the boot loader. The expected layout - * of the regs is: - * r3: ptr to residual data - * r4: initrd_start or if no initrd then 0 - * r5: initrd_end - unused if r4 is 0 - * r6: Start of command line string - * r7: End of command line string - * - * The Prep boot loader insure that the MMU is currently off... - * - */ - - mr r31,r3 /* save parameters */ - mr r30,r4 - mr r29,r5 - mr r28,r6 - mr r27,r7 - -#ifdef __ALTIVEC__ - /* enable altivec; gcc may use it! */ - mfmsr r0 - oris r0, r0, (1<<(31-16-6)) - mtmsr r0 - isync - /* - * set vscr and vrsave to known values - */ - li r0, 0 - mtvrsave r0 - vxor 0,0,0 - mtvscr 0 -#endif - - /* - * Make sure we have nothing in BATS and TLB - */ - bl CPU_clear_bats_early - bl flush_tlbs -/* - * Use the first pair of BAT registers to map the 1st 256MB - * of RAM to KERNELBASE. - */ - lis r11,KERNELBASE@h -/* set up BAT registers for 604 */ - ori r11,r11,0x1ffe - li r8,2 /* R/W access */ - isync - mtspr DBAT0L,r8 /* N.B. 6xx (not 601) have valid */ - mtspr DBAT0U,r11 /* bit in upper BAT register */ - mtspr IBAT0L,r8 - mtspr IBAT0U,r11 - isync -/* Map section where residual is located if outside - * the first 256Mb of RAM. This is to support cases - * where the available system memory is larger than - * 256Mb of RAM. - */ - mr r9, r1 /* Get where residual was mapped */ - lis r12,0xf0000000@h - and r9,r9,r12 - cmpi 0,1,r9, 0 - beq enter_C_code - isync - ori r11,r9,0x1ffe - mtspr DBAT1L,r8 /* N.B. 6xx (not 601) have valid */ - mtspr DBAT1U,r11 /* bit in upper BAT register */ - mtspr IBAT1L,r8 - mtspr IBAT1U,r11 - isync - -/* - * we now have the 1st 256M of ram mapped with the bats. We are still - * running on the bootloader stack and cannot switch to an RTEMS allocated - * init stack before copying the residual data that may have been set just after - * rtems_end address. This bug has been experienced on MVME2304. Thank to - * Till Straumann <strauman@SLAC.Stanford.EDU> for hunting it and suggesting - * the appropriate code. - */ - -enter_C_code: - bl MMUon - bl __eabi /* setup EABI and SYSV environment */ - bl zero_bss - /* - * restore prep boot params - */ - mr r3,r31 - mr r4,r30 - mr r5,r29 - mr r6,r28 - mr r7,r27 - bl save_boot_params - /* - * stack = &__rtems_end + 4096 - */ - addis r9,r0, __stack-PPC_MINIMUM_STACK_FRAME_SIZE@ha - addi r9,r9, __stack-PPC_MINIMUM_STACK_FRAME_SIZE@l - /* - * align initial stack - * (we hope that the bootloader stack was 16-byte aligned - * or we haven't used altivec yet...) - */ - li r0, (CPU_STACK_ALIGNMENT-1) - andc r1, r9, r0 - /* - * Tag TOS with a NULL (terminator for stack dump) - */ - li r0, 0 - stw r0, 0(r1) - - /* - * We are now in a environment that is totally independent from - * bootloader setup. - */ - /* pass result of 'save_boot_params' to 'boot_card' in R3 */ - bl boot_card - bl _return_to_ppcbug - - .globl MMUon - .type MMUon,@function -MMUon: - mfmsr r0 - ori r0,r0, MSR_IP | MSR_RI | MSR_IR | MSR_DR | MSR_EE | MSR_FE0 | MSR_FE1 | MSR_FP -#if (PPC_HAS_FPU == 0) - xori r0, r0, MSR_EE | MSR_IP | MSR_FP -#else - xori r0, r0, MSR_EE | MSR_IP | MSR_FE0 | MSR_FE1 -#endif - mflr r11 - mtsrr0 r11 - mtsrr1 r0 - SYNC - rfi - - .globl MMUoff - .type MMUoff,@function -MMUoff: - mfmsr r0 - ori r0,r0,MSR_IR| MSR_DR | MSR_IP - mflr r11 - xori r0,r0,MSR_IR|MSR_DR - mtsrr0 r11 - mtsrr1 r0 - SYNC - rfi - - .globl _return_to_ppcbug - .type _return_to_ppcbug,@function - -_return_to_ppcbug: - mflr r30 - bl MMUoff - MONITOR_ENTER - bl MMUon - mtctr r30 - bctr - -flush_tlbs: - lis r20, 0x1000 -1: addic. r20, r20, -0x1000 - tlbie r20 - bgt 1b - sync - blr |