/* * Creation Date: <2001/06/16 21:30:18 samuel> * Time-stamp: <2003/04/04 16:32:06 samuel> * * * * Asm glue for ELF images * * Copyright (C) 2001, 2002, 2003 Samuel Rydh (samuel@ibrium.se) * * 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 * */ #include "asm/asmdefs.h" #include "asm/processor.h" /************************************************************************/ /* Macros */ /************************************************************************/ #define ILLEGAL_VECTOR( v ) .org __vectors + v ; bl trap_error ; #define VECTOR( v, dummystr ) .org __vectors + v ; vector__##v #define EXCEPTION_PREAMBLE \ mtsprg1 r1 ; /* scratch */ \ mfsprg0 r1 ; /* exception stack in sprg0 */ \ addi r1,r1,-80 ; /* push exception frame */ \ \ stw r0,0(r1) ; /* save r0 */ \ mfsprg1 r0 ; \ stw r0,4(r1) ; /* save r1 */ \ stw r2,8(r1) ; /* save r2 */ \ stw r3,12(r1) ; /* save r3 */ \ stw r4,16(r1) ; \ stw r5,20(r1) ; \ stw r6,24(r1) ; \ stw r7,28(r1) ; \ stw r8,32(r1) ; \ stw r9,36(r1) ; \ stw r10,40(r1) ; \ stw r11,44(r1) ; \ stw r12,48(r1) ; \ \ mflr r0 ; \ stw r0,52(r1) ; \ mfcr r0 ; \ stw r0,56(r1) ; \ mfctr r0 ; \ stw r0,60(r1) ; \ mfxer r0 ; \ stw r0,64(r1) ; \ \ /* 76(r1) unused */ \ addi r1,r1,-16 ; /* call conventions uses 0(r1) and 4(r1)... */ /************************************************************************/ /* vectors */ /************************************************************************/ .section .text.vectors, "ax" GLOBL(__vectors): nop // NULL-jmp trap 1: nop // b 1b exception_return: addi r1,r1,16 // pop ABI frame lwz r0,52(r1) mtlr r0 lwz r0,56(r1) mtcr r0 lwz r0,60(r1) mtctr r0 lwz r0,64(r1) mtxer r0 lwz r0,0(r1) // restore r0 lwz r2,8(r1) // restore r2 lwz r3,12(r1) // restore r3 lwz r4,16(r1) lwz r5,20(r1) lwz r6,24(r1) lwz r7,28(r1) lwz r8,32(r1) lwz r9,36(r1) lwz r10,40(r1) lwz r11,44(r1) lwz r12,48(r1) lwz r1,4(r1) // restore r1 rfi .globl __divide_error __divide_error: trap_error: mflr r3 b unexpected_excep VECTOR( 0x100, "SRE" ): b _entry ILLEGAL_VECTOR( 0x200 ) VECTOR( 0x300, "DSI" ): EXCEPTION_PREAMBLE lis r3,HA(dsi_exception) addi r3,r3,LO(dsi_exception) mtctr r3 bctrl ba exception_return VECTOR( 0x400, "ISI" ): EXCEPTION_PREAMBLE lis r3,HA(isi_exception) addi r3,r3,LO(isi_exception) mtctr r3 bctrl ba exception_return ILLEGAL_VECTOR( 0x500 ) ILLEGAL_VECTOR( 0x600 ) ILLEGAL_VECTOR( 0x700 ) VECTOR( 0x800, "FPU" ): mtsprg1 r3 mfsrr1 r3 ori r3,r3,0x2000 mtsrr1 r3 mfsprg1 r3 rfi ILLEGAL_VECTOR( 0x900 ) ILLEGAL_VECTOR( 0xa00 ) ILLEGAL_VECTOR( 0xb00 ) ILLEGAL_VECTOR( 0xc00 ) ILLEGAL_VECTOR( 0xd00 ) ILLEGAL_VECTOR( 0xe00 ) ILLEGAL_VECTOR( 0xf00 ) ILLEGAL_VECTOR( 0xf20 ) ILLEGAL_VECTOR( 0x1000 ) ILLEGAL_VECTOR( 0x1100 ) ILLEGAL_VECTOR( 0x1200 ) ILLEGAL_VECTOR( 0x1300 ) ILLEGAL_VECTOR( 0x1400 ) ILLEGAL_VECTOR( 0x1500 ) ILLEGAL_VECTOR( 0x1600 ) ILLEGAL_VECTOR( 0x1700 ) GLOBL(__vectors_end): /************************************************************************/ /* entry */ /************************************************************************/ GLOBL(_entry): /* clear MSR, disable MMU */ li r0,0 mtmsr r0 /* copy exception vectors */ lis r3,HA(__vectors) addi r3,r3,LO(__vectors) li r4,0 li r5,__vectors_end - __vectors + 16 rlwinm r5,r5,0,0,28 1: lwz r6,0(r3) lwz r7,4(r3) lwz r8,8(r3) lwz r9,12(r3) stw r6,0(r4) stw r7,4(r4) stw r8,8(r4) stw r9,12(r4) dcbst 0,r4 sync icbi 0,r4 sync addi r5,r5,-16 addi r3,r3,16 addi r4,r4,16 cmpwi r5,0 bgt 1b isync bl compute_ramsize /* Memory map: * * Top +-------------------------+ * | | * | ROM into RAM (1 MB) | * | | * +-------------------------+ * | | * | MMU Hash Table (64 kB) | * | | * +-------------------------+ * | | * | Exception Stack (32 kB) * | | * +-------------------------+ * | | * | Stack (64 kB) * | | * +-------------------------+ * | | * | Client Stack (64 kB) | * | | * +-------------------------+ * : : * Bottom */ addis r1, r3, -16 /* ramsize - 1MB */ /* setup exception stack */ addis r1, r1, -1 /* - 64 kB */ mtsprg0 r1 /* setup stack */ addi r1, r1, -32768 /* - 32 kB */ /* save memory size in stack */ bl setup_mmu bl entry 1: nop b 1b /* According to IEEE 1275, PPC bindings: * * MSR = FP, ME + (DR|IR) * r1 = stack (32 K + 32 bytes link area above) * r5 = clint interface handler * r6 = address of client program arguments (unused) * r7 = length of client program arguments (unsed) * * Yaboot and Linux use r3 and r4 for initrd address and size */ .data saved_stack: .long 0 .previous /* void call_elf( arg1, arg2, entry ) */ GLOBL(call_elf): mflr r0 stwu r1,-16(r1) stw r0,20(r1) mtlr r5 lis r8,HA(saved_stack) addi r8,r8,LO(saved_stack) // save our stack pointer stw r1,0(r8) mfsdr1 r1 addis r1, r1, -96 lis r5,HA(of_client_callback) addi r5,r5,LO(of_client_callback) // r5 = callback li r6,0 // r6 = address of client program arguments (unused) li r7,0 // r7 = length of client program arguments (unused) li r0,MSR_FP | MSR_ME | MSR_DR | MSR_IR mtmsr r0 blrl lis r8,HA(saved_stack) addi r8,r8,LO(saved_stack) // restore stack pointer mr r1,r8 lwz r0,20(r1) mtlr r0 addi r1,r1,16 // XXX: should restore r12-r31 etc.. // we should not really come here though blr #define SAVE_SPACE 140 GLOBL(of_client_callback): stwu r1, -12(r1) /* save r4 */ stw r4, 8(r1) /* save lr */ mflr r4 stw r4, 4(r1) /* restore OF stack */ lis r4,HA(saved_stack) addi r4,r4,LO(saved_stack) lwz r4,0(r4) stwu r4,-SAVE_SPACE(r4) stw r1,8(r4) // save caller stack mr r1,r4 stw r2,12(r1) stw r0,16(r1) /* save ctr, cr and xer */ mfctr r2 stw r2,20(r1) mfcr r2 stw r2,24(r1) mfxer r2 stw r2,28(r1) /* save r5 - r31 */ stw r5, 32(r1) stw r6,36(r1) stw r7,40(r1) stw r8,44(r1) stw r9,48(r1) stw r10,52(r1) stw r11,56(r1) stw r12,60(r1) stw r13,64(r1) stw r14,68(r1) stw r15,72(r1) stw r16,76(r1) stw r17,80(r1) stw r18,84(r1) stw r19,88(r1) stw r20,92(r1) stw r21,96(r1) stw r22,100(r1) stw r23,104(r1) stw r24,108(r1) stw r25,112(r1) stw r26,116(r1) stw r27,120(r1) stw r28,124(r1) stw r29,128(r1) stw r30,132(r1) stw r31,136(r1) bl of_client_interface /* restore r5 - r31 */ lwz r5,32(r1) lwz r6,36(r1) lwz r7,40(r1) lwz r8,44(r1) lwz r9,48(r1) lwz r10,52(r1) lwz r11,56(r1) lwz r12,60(r1) lwz r13,64(r1) lwz r14,68(r1) lwz r15,72(r1) lwz r16,76(r1) lwz r17,80(r1) lwz r18,84(r1) lwz r19,88(r1) lwz r20,92(r1) lwz r21,96(r1) lwz r22,100(r1) lwz r23,104(r1) lwz r24,108(r1) lwz r25,112(r1) lwz r26,116(r1) lwz r27,120(r1) lwz r28,124(r1) lwz r29,128(r1) lwz r30,132(r1) lwz r31,136(r1) /* restore ctr, cr and xer */ lwz r2,20(r1) mtctr r2 lwz r2,24(r1) mtcr r2 lwz r2,28(r1) mtxer r2 /* restore r0 and r2 */ lwz r2,12(r1) lwz r0,16(r1) /* restore caller stack */ lwz r1,8(r1) lwz r4, 4(r1) mtlr r4 lwz r4, 8(r1) lwz r1, 0(r1) blr /* rtas glue (must be reloctable) */ GLOBL(of_rtas_start): /* r3 = argument buffer, r4 = of_rtas_start */ /* according to the CHRP standard, cr must be preserved (cr0/cr1 too?) */ blr GLOBL(of_rtas_end): /* used in a hack to the newworld calibration */ GLOBL(nw_dec_calibration): .long 0 GLOBL(timer_calib_start): lis r3,HA(nw_dec_calibration) addi r3,r3,LO(nw_dec_calibration) lwz r3,0(r3) blr GLOBL(timer_calib_end): #define CACHE_LINE_SIZE 32 #define LG_CACHE_LINE_SIZE 5 /* flush_icache_range( ulong start, ulong stop) */ GLOBL(flush_icache_range): li r5,CACHE_LINE_SIZE-1 andc r3,r3,r5 subf r4,r3,r4 add r4,r4,r5 srwi. r4,r4,LG_CACHE_LINE_SIZE beqlr mtctr r4 mr r6,r3 1: dcbst 0,r3 addi r3,r3,CACHE_LINE_SIZE bdnz 1b sync /* wait for dcbst's to get to ram */ mtctr r4 2: icbi 0,r6 addi r6,r6,CACHE_LINE_SIZE bdnz 2b sync /* additional sync needed on g4 */ isync blr /* Get RAM size from Qemu configuration device */ #define CFG_ADDR 0xf0000510 #define FW_CFG_RAM_SIZE 0x03 compute_ramsize: lis r9,HA(CFG_ADDR) ori r9,r9,LO(CFG_ADDR) li r0,FW_CFG_RAM_SIZE sth r0,0(r9) lis r9,HA(CFG_ADDR + 2) ori r9,r9,LO(CFG_ADDR + 2) lbz r1,0(r9) lbz r0,0(r9) slwi r0,r0,8 or r1,r1,r0 lbz r0,0(r9) slwi r0,r0,16 or r1,r1,r0 lbz r0,0(r9) slwi r0,r0,24 or r3,r1,r0 blr /* Hard reset vector */ .section .romentry,"ax" bl _entry