diff options
Diffstat (limited to 'slof/entry.S')
| -rw-r--r-- | slof/entry.S | 230 |
1 files changed, 98 insertions, 132 deletions
diff --git a/slof/entry.S b/slof/entry.S index 86e7680..f57ddab 100644 --- a/slof/entry.S +++ b/slof/entry.S @@ -1,89 +1,91 @@ -# ============================================================================= -# * Copyright (c) 2004, 2005 IBM Corporation -# * All rights reserved. -# * This program and the accompanying materials -# * are made available under the terms of the BSD License -# * which accompanies this distribution, and is available at -# * http://www.opensource.org/licenses/bsd-license.php -# * -# * Contributors: -# * IBM Corporation - initial implementation -# ============================================================================= - - -# -# The entry points into the engine, as well as everything else in low memory. -# - - .section ".slof.vectors","ax" - - . = 0 - - .asciz "SLOF, the SlimLine Open Firmware" - - - # - # The reset exception. +/****************************************************************************** + * Copyright (c) 2004, 2007 IBM Corporation + * All rights reserved. + * This program and the accompanying materials + * are made available under the terms of the BSD License + * which accompanies this distribution, and is available at + * http://www.opensource.org/licenses/bsd-license.php + * + * Contributors: + * IBM Corporation - initial implementation + *****************************************************************************/ +#include <macros.h> + # - - . = 0x0100 - mtsprg 0,0 - li 0,0x0100 - b handler - - - + # The generic exception code. # - # All other exceptions. + # Enter with GPR0 = vector, SPRG0 = saved GPR0 # - .irp i, 0x0200,0x0300,0x0380,0x0400,0x0480,0x0500,0x0600,0x0700, \ - 0x0800,0x0900,0x0a00,0x0b00,0x0c00,0x0d00,0x0e00,0x0f00, \ - 0x1000,0x1100,0x1200,0x1300,0x1400,0x1500,0x1600,0x1700, \ - 0x1800,0x1900,0x1a00,0x1b00,0x1c00,0x1d00,0x1e00,0x1f00, \ - 0x2000,0x2100,0x2200,0x2300,0x2400,0x2500,0x2600,0x2700, \ - 0x2800,0x2900,0x2a00,0x2b00,0x2c00,0x2d00,0x2e00,0x2f00 - . = \i - mtsprg 0,0 ; li 0,\i ; b handler - .endr - + .section ".entry_text" +the_handler: + .quad handler - # - # The generic exception code. - # - # Enter with GPR0 = vector, SPRG0 = saved GPR0. - # +eregs: + .quad _slof_start # XXX make configurable at startup time + # should stay page aligned! - . = 0x3000 handler: mtsprg 1,1 # SPRG1 = saved GPR1 - lis 1,0x0110 # GPR1 = address of register save area + bcl 20,31,$+4 + mflr 1 + ld 1,eregs-$+4(1) # GPR1 = address of register save area .irp i, 2,3,4,5,6,7,8,9,10,11,12,13,14,15, \ 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 std \i,\i*8(1) .endr # save GPR2..GPR31 - mr 3,0 # GPR3 = vector - - mfsprg 0,0 ; std 0,0(1) # save GPR0 - mfsprg 0,1 ; std 0,8(1) # save GPR1 - - mfcr 0 ; std 0,0x100(1) - mfxer 0 ; std 0,0x108(1) - mflr 0 ; std 0,0x110(1) - mfctr 0 ; std 0,0x118(1) - mfsrr0 0 ; std 0,0x120(1) - mfsrr1 0 ; std 0,0x128(1) - mfdar 0 ; std 0,0x130(1) - mfdsisr 0 ; std 0,0x138(1) # save special regs - - addi 1,1,0x7000 ; li 0,0 ; stdu 0,-16(1) # set up stack - lis 2,engine@ha ; ld 2,8+engine@l(2) # set up TOC pointer - b .engine # ...and go! - + mr 3,0 // GPR3 = vector + + mfsprg 0,0 + std 0,0(1) # save GPR0 + mfsprg 0,1 + std 0,8(1) # save GPR1 + + cmpwi r3, 0x900 # Decrementer interrupt + bne 0f + mfdec r4 # Save old value of decrementer as reason + lis r0,0x7fff # Set decrementer to highest value + mtdec r0 +0: + cmpwi r3, 0x500 # External interrupt + bne 0f + LOAD64(r4, 0x20000508408) + ld r4, 0(r4) # Read destructive interrupt reason +0: + mfcr 0 + std 0,0x100(1) + mfxer 0 + std 0,0x108(1) + mfsprg 0,3 # save lr + std 0,0x110(1) + mfsprg 0,2 # save ctr + std 0,0x118(1) + mfsrr0 0 + std 0,0x120(1) + mfsrr1 0 + std 0,0x128(1) + mfdar 0 + std 0,0x130(1) + mfdsisr 0 + std 0,0x138(1) # save special regs + + addi 1,1,0x7000 + li 0,0 + stdu 0,-0x10(1) + stdu 1,-0x100(1) # set up stack + + lis 2,engine@ha + ld 0,engine@l(2) # set up entry + mtsrr0 0 + + ld 2,8+engine@l(2) # set up TOC pointer + + rfid +# b .engine # ...and run! @@ -92,7 +94,7 @@ handler: # swap_ci_regs: - lis 8,0x0110 + lis 8,_slof_start@ha addi 8,8,0x0400 .irp i, 1,2,3,4,5,6,7, \ @@ -102,11 +104,19 @@ swap_ci_regs: mr \i,0 .endr # swap GPR1..7, GPR13..31 - ld 0,0x100(8) ; mfcr 9 ; mtcrf 0xff,0 ; std 9,0x100(8) # swap CR - ld 0,0x128(8) ; mfmsr 9 ; mtmsrd 0 ; sync ; isync ; std 9,0x128(8) - # swap MSR - blr + ld 0,0x100(8) + mfcr 9 + mtcrf 0xff,0 + std 9,0x100(8) # swap CR + ld 0,0x128(8) + mfmsr 9 + mtmsrd 0 + sync + isync + std 9,0x128(8) # swap MSR + + blr # # Entry point for the OF client interface. @@ -121,8 +131,11 @@ client_entry_point: .type .client_entry_point,@function .globl .client_entry_point .client_entry_point: - mflr 4 ; bl swap_ci_regs ; mtlr 4 ; li 3,0 ; blr - + mflr 4 + bl swap_ci_regs # swap regs + mtlr 4 + li 3, 0 # client call + blr # # Start the client. @@ -137,59 +150,12 @@ call_client: .type .call_client,@function .globl .call_client -.call_client: # called with GPR3 = address, returns GPR3 - mflr 4 ; mtctr 3 ; bl swap_ci_regs ; bctrl - bl swap_ci_regs ; mtlr 4 ; li 3,-1 ; blr - - - .globl flush_cache - .section ".opd","aw" - .align 3 -flush_cache: - .quad .flush_cache,.TOC.@tocbase,0 - .previous - .type .flush_cache,@function - .globl .flush_cache -.flush_cache: # flush at GPR3 size GPR4 - add 4,4,3 - addi 4,4,127 - rlwinm 3,3,0,0,24 - rlwinm 4,4,0,0,24 - sub 4,4,3 - srwi 4,4,7 - mtctr 4 -0: - dcbst 0,3 - sync - icbi 0,3 - sync - isync - addi 3,3,128 - bdnz 0b - +.call_client: # called with r3 = address, returns r3 + mflr 4 + mtctr 3 + bl swap_ci_regs + bctrl + bl swap_ci_regs + mtlr 4 + li 3, -1 # client app return blr - - - # - # This is where the secondary CPUs sit and wait. - # - - . = 0x3f00 -slaveloop: - lis 0,10 - mtctr 0 - bdnz $ # do some waiting, to prevent flooding the buses - lwz 0,0x3f40(0) - and. 0,0,0 - beq $-20 # wait for our flag - - lwz 0,0x3f80(0) - lwz 3,0x3fc0(0) - mtctr 0 - bctr # jump to specified address, with specified GPR3 - - - - -. = 0x3fff -.byte 0x36 # to fill out to exactly 16kB |