2008-12-21 08:30:42 +00:00
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/*
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* Creation Date: <2001/06/16 21:30:18 samuel>
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* Time-stamp: <2003/04/04 16:32:06 samuel>
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*
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* <init.S>
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*
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* Asm glue for ELF images
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*
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* Copyright (C) 2001, 2002, 2003 Samuel Rydh (samuel@ibrium.se)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation
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*
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*/
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#include "asm/asmdefs.h"
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#include "asm/processor.h"
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/************************************************************************/
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/* Macros */
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/************************************************************************/
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#define ILLEGAL_VECTOR( v ) .org __vectors + v ; bl trap_error ;
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#define VECTOR( v, dummystr ) .org __vectors + v ; vector__##v
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#define EXCEPTION_PREAMBLE \
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mtsprg1 r1 ; /* scratch */ \
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mfsprg0 r1 ; /* exception stack in sprg0 */ \
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addi r1,r1,-80 ; /* push exception frame */ \
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\
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stw r0,0(r1) ; /* save r0 */ \
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mfsprg1 r0 ; \
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stw r0,4(r1) ; /* save r1 */ \
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stw r2,8(r1) ; /* save r2 */ \
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stw r3,12(r1) ; /* save r3 */ \
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stw r4,16(r1) ; \
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stw r5,20(r1) ; \
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stw r6,24(r1) ; \
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stw r7,28(r1) ; \
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stw r8,32(r1) ; \
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stw r9,36(r1) ; \
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stw r10,40(r1) ; \
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stw r11,44(r1) ; \
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stw r12,48(r1) ; \
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\
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mflr r0 ; \
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stw r0,52(r1) ; \
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mfcr r0 ; \
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stw r0,56(r1) ; \
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mfctr r0 ; \
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stw r0,60(r1) ; \
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mfxer r0 ; \
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stw r0,64(r1) ; \
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\
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/* 76(r1) unused */ \
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addi r1,r1,-16 ; /* call conventions uses 0(r1) and 4(r1)... */
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/************************************************************************/
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2009-01-04 16:01:50 +00:00
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/* vectors */
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2008-12-21 08:30:42 +00:00
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/************************************************************************/
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2008-12-21 10:17:03 +00:00
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.section .text.vectors, "ax"
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2009-01-04 16:01:50 +00:00
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GLOBL(__vectors):
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nop // NULL-jmp trap
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1: nop //
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b 1b
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exception_return:
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addi r1,r1,16 // pop ABI frame
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lwz r0,52(r1)
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mtlr r0
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lwz r0,56(r1)
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mtcr r0
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lwz r0,60(r1)
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mtctr r0
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lwz r0,64(r1)
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mtxer r0
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lwz r0,0(r1) // restore r0
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lwz r2,8(r1) // restore r2
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lwz r3,12(r1) // restore r3
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lwz r4,16(r1)
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lwz r5,20(r1)
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lwz r6,24(r1)
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lwz r7,28(r1)
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lwz r8,32(r1)
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lwz r9,36(r1)
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lwz r10,40(r1)
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lwz r11,44(r1)
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lwz r12,48(r1)
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lwz r1,4(r1) // restore r1
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rfi
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.globl __divide_error
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__divide_error:
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trap_error:
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mflr r3
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b unexpected_excep
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VECTOR( 0x100, "SRE" ):
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b _entry
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ILLEGAL_VECTOR( 0x200 )
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VECTOR( 0x300, "DSI" ):
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EXCEPTION_PREAMBLE
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lis r3,HA(dsi_exception)
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addi r3,r3,LO(dsi_exception)
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mtctr r3
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bctrl
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ba exception_return
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VECTOR( 0x400, "ISI" ):
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EXCEPTION_PREAMBLE
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lis r3,HA(isi_exception)
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addi r3,r3,LO(isi_exception)
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mtctr r3
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bctrl
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ba exception_return
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ILLEGAL_VECTOR( 0x500 )
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ILLEGAL_VECTOR( 0x600 )
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ILLEGAL_VECTOR( 0x700 )
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VECTOR( 0x800, "FPU" ):
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mtsprg1 r3
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mfsrr1 r3
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ori r3,r3,0x2000
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mtsrr1 r3
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mfsprg1 r3
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rfi
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ILLEGAL_VECTOR( 0x900 )
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ILLEGAL_VECTOR( 0xa00 )
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ILLEGAL_VECTOR( 0xb00 )
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ILLEGAL_VECTOR( 0xc00 )
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ILLEGAL_VECTOR( 0xd00 )
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ILLEGAL_VECTOR( 0xe00 )
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ILLEGAL_VECTOR( 0xf00 )
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ILLEGAL_VECTOR( 0xf20 )
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ILLEGAL_VECTOR( 0x1000 )
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ILLEGAL_VECTOR( 0x1100 )
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ILLEGAL_VECTOR( 0x1200 )
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ILLEGAL_VECTOR( 0x1300 )
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ILLEGAL_VECTOR( 0x1400 )
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ILLEGAL_VECTOR( 0x1500 )
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ILLEGAL_VECTOR( 0x1600 )
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ILLEGAL_VECTOR( 0x1700 )
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GLOBL(__vectors_end):
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/************************************************************************/
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/* entry */
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/************************************************************************/
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GLOBL(_entry):
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2008-12-21 08:30:42 +00:00
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/* clear MSR, disable MMU */
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li r0,0
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mtmsr r0
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/* copy exception vectors */
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lis r3,HA(__vectors)
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addi r3,r3,LO(__vectors)
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li r4,0
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li r5,__vectors_end - __vectors + 16
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rlwinm r5,r5,0,0,28
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1: lwz r6,0(r3)
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lwz r7,4(r3)
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lwz r8,8(r3)
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lwz r9,12(r3)
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stw r6,0(r4)
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stw r7,4(r4)
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stw r8,8(r4)
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stw r9,12(r4)
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dcbst 0,r4
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sync
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icbi 0,r4
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sync
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addi r5,r5,-16
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addi r3,r3,16
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addi r4,r4,16
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cmpwi r5,0
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bgt 1b
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isync
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bl compute_ramsize
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/* Memory map:
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*
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* Top +-------------------------+
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* | |
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* | ROM into RAM (1 MB) |
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* | |
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* +-------------------------+
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* | |
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* | MMU Hash Table (64 kB) |
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* | |
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* +-------------------------+
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* | |
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* | Exception Stack (32 kB)
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* | |
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* +-------------------------+
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* | |
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* | Stack (64 kB)
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* | |
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* +-------------------------+
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* | |
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* | Client Stack (64 kB) |
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* | |
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* +-------------------------+
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* : :
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* Bottom
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*/
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addis r1, r3, -16 /* ramsize - 1MB */
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/* setup exception stack */
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addis r1, r1, -1 /* - 64 kB */
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mtsprg0 r1
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/* setup stack */
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addi r1, r1, -32768 /* - 32 kB */
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/* save memory size in stack */
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bl setup_mmu
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bl entry
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1: nop
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b 1b
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/* According to IEEE 1275, PPC bindings:
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*
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* MSR = FP, ME + (DR|IR)
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* r1 = stack (32 K + 32 bytes link area above)
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* r5 = clint interface handler
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* r6 = address of client program arguments (unused)
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* r7 = length of client program arguments (unsed)
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2009-01-04 19:25:41 +00:00
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*
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* Yaboot and Linux use r3 and r4 for initrd address and size
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2008-12-21 08:30:42 +00:00
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*/
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2008-12-21 10:17:03 +00:00
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.data
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2008-12-21 08:30:42 +00:00
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saved_stack:
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.long 0
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2008-12-21 10:17:03 +00:00
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.previous
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2009-01-04 19:25:41 +00:00
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/* void call_elf( arg1, arg2, entry ) */
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2008-12-21 08:30:42 +00:00
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GLOBL(call_elf):
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mflr r0
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stwu r1,-16(r1)
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stw r0,20(r1)
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2009-01-04 19:25:41 +00:00
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mtlr r5
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2008-12-21 08:30:42 +00:00
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lis r8,HA(saved_stack)
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addi r8,r8,LO(saved_stack) // save our stack pointer
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stw r1,0(r8)
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mfsdr1 r1
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addis r1, r1, -96
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lis r5,HA(of_client_callback)
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addi r5,r5,LO(of_client_callback) // r5 = callback
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li r6,0 // r6 = address of client program arguments (unused)
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li r7,0 // r7 = length of client program arguments (unused)
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li r0,MSR_FP | MSR_ME | MSR_DR | MSR_IR
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mtmsr r0
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blrl
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lis r8,HA(saved_stack)
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addi r8,r8,LO(saved_stack) // restore stack pointer
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mr r1,r8
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lwz r0,20(r1)
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mtlr r0
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addi r1,r1,16
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// XXX: should restore r12-r31 etc..
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// we should not really come here though
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blr
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According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
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#define SAVE_SPACE 140
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2008-12-21 08:30:42 +00:00
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GLOBL(of_client_callback):
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According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
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stwu r1, -12(r1)
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/* save r4 */
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stw r4, 8(r1)
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/* save lr */
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mflr r4
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stw r4, 4(r1)
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/* restore OF stack */
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2008-12-21 08:30:42 +00:00
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lis r4,HA(saved_stack)
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addi r4,r4,LO(saved_stack)
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lwz r4,0(r4)
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According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
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stwu r4,-SAVE_SPACE(r4)
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2008-12-21 08:30:42 +00:00
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stw r1,8(r4) // save caller stack
|
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|
mr r1,r4
|
According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
|
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2008-12-21 08:30:42 +00:00
|
|
|
stw r2,12(r1)
|
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stw r0,16(r1)
|
According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
|
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|
/* save ctr, cr and xer */
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|
2008-12-21 08:30:42 +00:00
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mfctr r2
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stw r2,20(r1)
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mfcr r2
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stw r2,24(r1)
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mfxer r2
|
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|
stw r2,28(r1)
|
According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
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|
/* save r5 - r31 */
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stw r5, 32(r1)
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stw r6,36(r1)
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stw r7,40(r1)
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stw r8,44(r1)
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stw r9,48(r1)
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stw r10,52(r1)
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stw r11,56(r1)
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stw r12,60(r1)
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stw r13,64(r1)
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stw r14,68(r1)
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stw r15,72(r1)
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stw r16,76(r1)
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stw r17,80(r1)
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stw r18,84(r1)
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stw r19,88(r1)
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stw r20,92(r1)
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stw r21,96(r1)
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stw r22,100(r1)
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stw r23,104(r1)
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stw r24,108(r1)
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stw r25,112(r1)
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stw r26,116(r1)
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stw r27,120(r1)
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stw r28,124(r1)
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stw r29,128(r1)
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stw r30,132(r1)
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stw r31,136(r1)
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2008-12-21 08:30:42 +00:00
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|
bl of_client_interface
|
According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
|
|
|
|
|
|
|
|
/* restore r5 - r31 */
|
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lwz r5,32(r1)
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lwz r6,36(r1)
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lwz r7,40(r1)
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lwz r8,44(r1)
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lwz r9,48(r1)
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lwz r10,52(r1)
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|
lwz r11,56(r1)
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lwz r12,60(r1)
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lwz r13,64(r1)
|
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|
lwz r14,68(r1)
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|
lwz r15,72(r1)
|
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lwz r16,76(r1)
|
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|
|
|
lwz r17,80(r1)
|
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lwz r18,84(r1)
|
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|
lwz r19,88(r1)
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|
lwz r20,92(r1)
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|
lwz r21,96(r1)
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lwz r22,100(r1)
|
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|
lwz r23,104(r1)
|
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|
|
lwz r24,108(r1)
|
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|
|
|
lwz r25,112(r1)
|
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|
|
|
lwz r26,116(r1)
|
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|
|
|
lwz r27,120(r1)
|
|
|
|
|
lwz r28,124(r1)
|
|
|
|
|
lwz r29,128(r1)
|
|
|
|
|
lwz r30,132(r1)
|
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|
|
lwz r31,136(r1)
|
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|
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|
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|
|
|
|
/* restore ctr, cr and xer */
|
|
|
|
|
|
2008-12-21 08:30:42 +00:00
|
|
|
lwz r2,20(r1)
|
|
|
|
|
mtctr r2
|
|
|
|
|
lwz r2,24(r1)
|
|
|
|
|
mtcr r2
|
|
|
|
|
lwz r2,28(r1)
|
|
|
|
|
mtxer r2
|
According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
|
|
|
|
|
|
|
|
/* restore r0 and r2 */
|
|
|
|
|
|
2008-12-21 08:30:42 +00:00
|
|
|
lwz r2,12(r1)
|
|
|
|
|
lwz r0,16(r1)
|
According to
"PowerPC Processor binding to:
IEEE 1275-1994, Standard for Boot (Initialization, Configuration) Firmware
Revision: 2.1 (Approved Version), November 6, 1996"
7.1 Calling Convention:
Client interface preserves: msr, cr, r1, r2, r13-r31, sprg0-3, fpscr, f0-f31,
sr0-sr15, other SPRs.
This patch modifies of_client_callback(), to preserve r1, r2, r4-r31.
This is needed to be able to execute the first stage of quik which
supposes r7 is unmodified.
git-svn-id: svn://coreboot.org/openbios/openbios-devel@384 f158a5a8-5612-0410-a976-696ce0be7e32
2009-01-11 00:01:40 +00:00
|
|
|
|
|
|
|
|
/* restore caller stack */
|
|
|
|
|
|
|
|
|
|
lwz r1,8(r1)
|
|
|
|
|
|
|
|
|
|
lwz r4, 4(r1)
|
|
|
|
|
mtlr r4
|
|
|
|
|
lwz r4, 8(r1)
|
|
|
|
|
lwz r1, 0(r1)
|
|
|
|
|
|
2008-12-21 08:30:42 +00:00
|
|
|
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):
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#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
|
|
|
|
|
|
2008-12-23 20:36:45 +00:00
|
|
|
/* Get RAM size from Qemu configuration device */
|
2008-12-21 08:30:42 +00:00
|
|
|
|
2008-12-23 20:36:45 +00:00
|
|
|
#define CFG_ADDR 0xf0000510
|
|
|
|
|
#define FW_CFG_RAM_SIZE 0x03
|
2008-12-21 08:30:42 +00:00
|
|
|
|
2008-12-23 20:36:45 +00:00
|
|
|
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
|
2008-12-21 08:30:42 +00:00
|
|
|
|
2008-12-21 10:17:03 +00:00
|
|
|
/* Hard reset vector */
|
2008-12-21 08:30:42 +00:00
|
|
|
.section .romentry,"ax"
|
2009-01-04 16:01:50 +00:00
|
|
|
bl _entry
|
