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https://github.com/edk2-porting/linux-next.git
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2e6f40deb7
This makes the altivec code in swsusp_32.S depend on CONFIG_ALTIVEC to avoid build failures for systems that don't have altivec. I'm not sure whether the code will actually work for other systems, but it was merged for just ppc32 rather than powermac a very long time ago. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Paul Mackerras <paulus@samba.org>
351 lines
6.6 KiB
ArmAsm
351 lines
6.6 KiB
ArmAsm
#include <linux/threads.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/cputable.h>
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#include <asm/thread_info.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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/*
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* Structure for storing CPU registers on the save area.
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*/
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#define SL_SP 0
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#define SL_PC 4
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#define SL_MSR 8
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#define SL_SDR1 0xc
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#define SL_SPRG0 0x10 /* 4 sprg's */
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#define SL_DBAT0 0x20
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#define SL_IBAT0 0x28
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#define SL_DBAT1 0x30
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#define SL_IBAT1 0x38
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#define SL_DBAT2 0x40
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#define SL_IBAT2 0x48
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#define SL_DBAT3 0x50
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#define SL_IBAT3 0x58
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#define SL_TB 0x60
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#define SL_R2 0x68
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#define SL_CR 0x6c
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#define SL_LR 0x70
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#define SL_R12 0x74 /* r12 to r31 */
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#define SL_SIZE (SL_R12 + 80)
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.section .data
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.align 5
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_GLOBAL(swsusp_save_area)
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.space SL_SIZE
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.section .text
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.align 5
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_GLOBAL(swsusp_arch_suspend)
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lis r11,swsusp_save_area@h
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ori r11,r11,swsusp_save_area@l
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mflr r0
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stw r0,SL_LR(r11)
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mfcr r0
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stw r0,SL_CR(r11)
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stw r1,SL_SP(r11)
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stw r2,SL_R2(r11)
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stmw r12,SL_R12(r11)
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/* Save MSR & SDR1 */
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mfmsr r4
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stw r4,SL_MSR(r11)
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mfsdr1 r4
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stw r4,SL_SDR1(r11)
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/* Get a stable timebase and save it */
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1: mftbu r4
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stw r4,SL_TB(r11)
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mftb r5
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stw r5,SL_TB+4(r11)
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mftbu r3
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cmpw r3,r4
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bne 1b
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/* Save SPRGs */
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mfsprg r4,0
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stw r4,SL_SPRG0(r11)
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mfsprg r4,1
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stw r4,SL_SPRG0+4(r11)
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mfsprg r4,2
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stw r4,SL_SPRG0+8(r11)
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mfsprg r4,3
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stw r4,SL_SPRG0+12(r11)
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/* Save BATs */
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mfdbatu r4,0
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stw r4,SL_DBAT0(r11)
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mfdbatl r4,0
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stw r4,SL_DBAT0+4(r11)
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mfdbatu r4,1
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stw r4,SL_DBAT1(r11)
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mfdbatl r4,1
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stw r4,SL_DBAT1+4(r11)
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mfdbatu r4,2
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stw r4,SL_DBAT2(r11)
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mfdbatl r4,2
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stw r4,SL_DBAT2+4(r11)
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mfdbatu r4,3
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stw r4,SL_DBAT3(r11)
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mfdbatl r4,3
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stw r4,SL_DBAT3+4(r11)
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mfibatu r4,0
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stw r4,SL_IBAT0(r11)
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mfibatl r4,0
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stw r4,SL_IBAT0+4(r11)
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mfibatu r4,1
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stw r4,SL_IBAT1(r11)
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mfibatl r4,1
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stw r4,SL_IBAT1+4(r11)
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mfibatu r4,2
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stw r4,SL_IBAT2(r11)
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mfibatl r4,2
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stw r4,SL_IBAT2+4(r11)
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mfibatu r4,3
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stw r4,SL_IBAT3(r11)
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mfibatl r4,3
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stw r4,SL_IBAT3+4(r11)
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#if 0
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/* Backup various CPU config stuffs */
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bl __save_cpu_setup
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#endif
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/* Call the low level suspend stuff (we should probably have made
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* a stackframe...
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*/
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bl swsusp_save
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/* Restore LR from the save area */
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lis r11,swsusp_save_area@h
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ori r11,r11,swsusp_save_area@l
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lwz r0,SL_LR(r11)
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mtlr r0
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blr
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/* Resume code */
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_GLOBAL(swsusp_arch_resume)
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#ifdef CONFIG_ALTIVEC
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/* Stop pending alitvec streams and memory accesses */
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BEGIN_FTR_SECTION
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DSSALL
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END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
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#endif
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sync
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/* Disable MSR:DR to make sure we don't take a TLB or
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* hash miss during the copy, as our hash table will
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* for a while be unuseable. For .text, we assume we are
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* covered by a BAT. This works only for non-G5 at this
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* point. G5 will need a better approach, possibly using
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* a small temporary hash table filled with large mappings,
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* disabling the MMU completely isn't a good option for
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* performance reasons.
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* (Note that 750's may have the same performance issue as
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* the G5 in this case, we should investigate using moving
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* BATs for these CPUs)
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*/
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mfmsr r0
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sync
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rlwinm r0,r0,0,28,26 /* clear MSR_DR */
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mtmsr r0
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sync
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isync
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/* Load ptr the list of pages to copy in r3 */
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lis r11,(restore_pblist - KERNELBASE)@h
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ori r11,r11,restore_pblist@l
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lwz r10,0(r11)
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/* Copy the pages. This is a very basic implementation, to
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* be replaced by something more cache efficient */
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1:
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tophys(r3,r10)
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li r0,256
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mtctr r0
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lwz r11,pbe_address(r3) /* source */
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tophys(r5,r11)
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lwz r10,pbe_orig_address(r3) /* destination */
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tophys(r6,r10)
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2:
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lwz r8,0(r5)
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lwz r9,4(r5)
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lwz r10,8(r5)
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lwz r11,12(r5)
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addi r5,r5,16
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stw r8,0(r6)
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stw r9,4(r6)
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stw r10,8(r6)
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stw r11,12(r6)
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addi r6,r6,16
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bdnz 2b
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lwz r10,pbe_next(r3)
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cmpwi 0,r10,0
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bne 1b
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/* Do a very simple cache flush/inval of the L1 to ensure
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* coherency of the icache
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*/
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lis r3,0x0002
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mtctr r3
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li r3, 0
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1:
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lwz r0,0(r3)
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addi r3,r3,0x0020
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bdnz 1b
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isync
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sync
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/* Now flush those cache lines */
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lis r3,0x0002
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mtctr r3
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li r3, 0
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1:
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dcbf 0,r3
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addi r3,r3,0x0020
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bdnz 1b
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sync
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/* Ok, we are now running with the kernel data of the old
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* kernel fully restored. We can get to the save area
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* easily now. As for the rest of the code, it assumes the
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* loader kernel and the booted one are exactly identical
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*/
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lis r11,swsusp_save_area@h
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ori r11,r11,swsusp_save_area@l
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tophys(r11,r11)
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#if 0
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/* Restore various CPU config stuffs */
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bl __restore_cpu_setup
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#endif
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/* Restore the BATs, and SDR1. Then we can turn on the MMU.
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* This is a bit hairy as we are running out of those BATs,
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* but first, our code is probably in the icache, and we are
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* writing the same value to the BAT, so that should be fine,
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* though a better solution will have to be found long-term
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*/
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lwz r4,SL_SDR1(r11)
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mtsdr1 r4
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lwz r4,SL_SPRG0(r11)
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mtsprg 0,r4
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lwz r4,SL_SPRG0+4(r11)
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mtsprg 1,r4
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lwz r4,SL_SPRG0+8(r11)
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mtsprg 2,r4
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lwz r4,SL_SPRG0+12(r11)
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mtsprg 3,r4
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#if 0
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lwz r4,SL_DBAT0(r11)
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mtdbatu 0,r4
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lwz r4,SL_DBAT0+4(r11)
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mtdbatl 0,r4
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lwz r4,SL_DBAT1(r11)
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mtdbatu 1,r4
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lwz r4,SL_DBAT1+4(r11)
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mtdbatl 1,r4
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lwz r4,SL_DBAT2(r11)
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mtdbatu 2,r4
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lwz r4,SL_DBAT2+4(r11)
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mtdbatl 2,r4
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lwz r4,SL_DBAT3(r11)
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mtdbatu 3,r4
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lwz r4,SL_DBAT3+4(r11)
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mtdbatl 3,r4
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lwz r4,SL_IBAT0(r11)
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mtibatu 0,r4
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lwz r4,SL_IBAT0+4(r11)
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mtibatl 0,r4
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lwz r4,SL_IBAT1(r11)
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mtibatu 1,r4
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lwz r4,SL_IBAT1+4(r11)
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mtibatl 1,r4
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lwz r4,SL_IBAT2(r11)
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mtibatu 2,r4
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lwz r4,SL_IBAT2+4(r11)
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mtibatl 2,r4
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lwz r4,SL_IBAT3(r11)
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mtibatu 3,r4
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lwz r4,SL_IBAT3+4(r11)
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mtibatl 3,r4
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#endif
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BEGIN_FTR_SECTION
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li r4,0
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mtspr SPRN_DBAT4U,r4
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mtspr SPRN_DBAT4L,r4
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mtspr SPRN_DBAT5U,r4
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mtspr SPRN_DBAT5L,r4
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mtspr SPRN_DBAT6U,r4
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mtspr SPRN_DBAT6L,r4
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mtspr SPRN_DBAT7U,r4
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mtspr SPRN_DBAT7L,r4
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mtspr SPRN_IBAT4U,r4
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mtspr SPRN_IBAT4L,r4
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mtspr SPRN_IBAT5U,r4
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mtspr SPRN_IBAT5L,r4
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mtspr SPRN_IBAT6U,r4
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mtspr SPRN_IBAT6L,r4
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mtspr SPRN_IBAT7U,r4
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mtspr SPRN_IBAT7L,r4
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END_FTR_SECTION_IFSET(CPU_FTR_HAS_HIGH_BATS)
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/* Flush all TLBs */
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lis r4,0x1000
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1: addic. r4,r4,-0x1000
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tlbie r4
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blt 1b
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sync
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/* restore the MSR and turn on the MMU */
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lwz r3,SL_MSR(r11)
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bl turn_on_mmu
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tovirt(r11,r11)
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/* Restore TB */
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li r3,0
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mttbl r3
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lwz r3,SL_TB(r11)
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lwz r4,SL_TB+4(r11)
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mttbu r3
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mttbl r4
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/* Kick decrementer */
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li r0,1
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mtdec r0
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/* Restore the callee-saved registers and return */
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lwz r0,SL_CR(r11)
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mtcr r0
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lwz r2,SL_R2(r11)
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lmw r12,SL_R12(r11)
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lwz r1,SL_SP(r11)
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lwz r0,SL_LR(r11)
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mtlr r0
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// XXX Note: we don't really need to call swsusp_resume
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li r3,0
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blr
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/* FIXME:This construct is actually not useful since we don't shut
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* down the instruction MMU, we could just flip back MSR-DR on.
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*/
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turn_on_mmu:
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mflr r4
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mtsrr0 r4
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mtsrr1 r3
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sync
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isync
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rfi
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