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 | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/start/start.S b/c/src/lib/libbsp/powerpc/shared/start/start.S new file mode 100644 index 0000000000..cc2dabd2c7 --- /dev/null +++ b/c/src/lib/libbsp/powerpc/shared/start/start.S @@ -0,0 +1,131 @@ +/* + * 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 found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + * + */ + +#include <libcpu/cpu.h> +#include <libcpu/io.h> +#include <rtems/score/targopts.h> +#include <rtems/score/cpu.h> +#include "asm.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 + * + */ + + mr r31,r3 /* save parameters */ + mr r30,r4 + mr r29,r5 + mr r28,r6 + mr r27,r7 +/* + * Use the first pair of BAT registers to map the 1st 64MB + * of RAM to KERNELBASE. + */ + lis r11,KERNELBASE@h + ori r11,r11,0x7fe /* set up BAT registers for 604 */ + li r8,2 /* R/W access */ + 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 + +/* + * we now have the 1st 64M of ram mapped with the bats. + */ + +enter_C_code: + bl MMUon + /* + * stack = &__rtems_end + 4096 + */ + addis r9,r0, __rtems_end+(4096-CPU_MINIMUM_STACK_FRAME_SIZE)@ha + addi r9,r9, __rtems_end+(4096-CPU_MINIMUM_STACK_FRAME_SIZE)@l + mr r1, r9 + 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 + 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 + xori r0, r0, MSR_EE | MSR_IP | MSR_FP + 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 |