/* * This file contains miscellaneous low-level functions. * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) * and Paul Mackerras. * * kexec bits: * Copyright (C) 2002-2003 Eric Biederman * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz * * 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; either version * 2 of the License, or (at your option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include .text #ifdef CONFIG_IRQSTACKS _GLOBAL(call_do_softirq) mflr r0 stw r0,4(r1) stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) mr r1,r3 bl __do_softirq lwz r1,0(r1) lwz r0,4(r1) mtlr r0 blr _GLOBAL(call_handle_irq) mflr r0 stw r0,4(r1) mtctr r6 stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r5) mr r1,r5 bctrl lwz r1,0(r1) lwz r0,4(r1) mtlr r0 blr #endif /* CONFIG_IRQSTACKS */ /* * This returns the high 64 bits of the product of two 64-bit numbers. */ _GLOBAL(mulhdu) cmpwi r6,0 cmpwi cr1,r3,0 mr r10,r4 mulhwu r4,r4,r5 beq 1f mulhwu r0,r10,r6 mullw r7,r10,r5 addc r7,r0,r7 addze r4,r4 1: beqlr cr1 /* all done if high part of A is 0 */ mr r10,r3 mullw r9,r3,r5 mulhwu r3,r3,r5 beq 2f mullw r0,r10,r6 mulhwu r8,r10,r6 addc r7,r0,r7 adde r4,r4,r8 addze r3,r3 2: addc r4,r4,r9 addze r3,r3 blr /* * sub_reloc_offset(x) returns x - reloc_offset(). */ _GLOBAL(sub_reloc_offset) mflr r0 bl 1f 1: mflr r5 lis r4,1b@ha addi r4,r4,1b@l subf r5,r4,r5 subf r3,r5,r3 mtlr r0 blr /* * reloc_got2 runs through the .got2 section adding an offset * to each entry. */ _GLOBAL(reloc_got2) mflr r11 lis r7,__got2_start@ha addi r7,r7,__got2_start@l lis r8,__got2_end@ha addi r8,r8,__got2_end@l subf r8,r7,r8 srwi. r8,r8,2 beqlr mtctr r8 bl 1f 1: mflr r0 lis r4,1b@ha addi r4,r4,1b@l subf r0,r4,r0 add r7,r0,r7 2: lwz r0,0(r7) add r0,r0,r3 stw r0,0(r7) addi r7,r7,4 bdnz 2b mtlr r11 blr /* * call_setup_cpu - call the setup_cpu function for this cpu * r3 = data offset, r24 = cpu number * * Setup function is called with: * r3 = data offset * r4 = ptr to CPU spec (relocated) */ _GLOBAL(call_setup_cpu) addis r4,r3,cur_cpu_spec@ha addi r4,r4,cur_cpu_spec@l lwz r4,0(r4) add r4,r4,r3 lwz r5,CPU_SPEC_SETUP(r4) cmpwi 0,r5,0 add r5,r5,r3 beqlr mtctr r5 bctr #if defined(CONFIG_CPU_FREQ_PMAC) && defined(CONFIG_6xx) /* This gets called by via-pmu.c to switch the PLL selection * on 750fx CPU. This function should really be moved to some * other place (as most of the cpufreq code in via-pmu */ _GLOBAL(low_choose_750fx_pll) /* Clear MSR:EE */ mfmsr r7 rlwinm r0,r7,0,17,15 mtmsr r0 /* If switching to PLL1, disable HID0:BTIC */ cmplwi cr0,r3,0 beq 1f mfspr r5,SPRN_HID0 rlwinm r5,r5,0,27,25 sync mtspr SPRN_HID0,r5 isync sync 1: /* Calc new HID1 value */ mfspr r4,SPRN_HID1 /* Build a HID1:PS bit from parameter */ rlwinm r5,r3,16,15,15 /* Clear out HID1:PS from value read */ rlwinm r4,r4,0,16,14 /* Could have I used rlwimi here ? */ or r4,r4,r5 mtspr SPRN_HID1,r4 /* Store new HID1 image */ rlwinm r6,r1,0,0,(31-THREAD_SHIFT) lwz r6,TI_CPU(r6) slwi r6,r6,2 addis r6,r6,nap_save_hid1@ha stw r4,nap_save_hid1@l(r6) /* If switching to PLL0, enable HID0:BTIC */ cmplwi cr0,r3,0 bne 1f mfspr r5,SPRN_HID0 ori r5,r5,HID0_BTIC sync mtspr SPRN_HID0,r5 isync sync 1: /* Return */ mtmsr r7 blr _GLOBAL(low_choose_7447a_dfs) /* Clear MSR:EE */ mfmsr r7 rlwinm r0,r7,0,17,15 mtmsr r0 /* Calc new HID1 value */ mfspr r4,SPRN_HID1 insrwi r4,r3,1,9 /* insert parameter into bit 9 */ sync mtspr SPRN_HID1,r4 sync isync /* Return */ mtmsr r7 blr #endif /* CONFIG_CPU_FREQ_PMAC && CONFIG_6xx */ /* * complement mask on the msr then "or" some values on. * _nmask_and_or_msr(nmask, value_to_or) */ _GLOBAL(_nmask_and_or_msr) mfmsr r0 /* Get current msr */ andc r0,r0,r3 /* And off the bits set in r3 (first parm) */ or r0,r0,r4 /* Or on the bits in r4 (second parm) */ SYNC /* Some chip revs have problems here... */ mtmsr r0 /* Update machine state */ isync blr /* Done */ #ifdef CONFIG_40x /* * Do an IO access in real mode */ _GLOBAL(real_readb) mfmsr r7 ori r0,r7,MSR_DR xori r0,r0,MSR_DR sync mtmsr r0 sync isync lbz r3,0(r3) sync mtmsr r7 sync isync blr /* * Do an IO access in real mode */ _GLOBAL(real_writeb) mfmsr r7 ori r0,r7,MSR_DR xori r0,r0,MSR_DR sync mtmsr r0 sync isync stb r3,0(r4) sync mtmsr r7 sync isync blr #endif /* CONFIG_40x */ /* * Flush MMU TLB */ #ifndef CONFIG_FSL_BOOKE _GLOBAL(_tlbil_all) _GLOBAL(_tlbil_pid) #endif _GLOBAL(_tlbia) #if defined(CONFIG_40x) sync /* Flush to memory before changing mapping */ tlbia isync /* Flush shadow TLB */ #elif defined(CONFIG_44x) li r3,0 sync /* Load high watermark */ lis r4,tlb_44x_hwater@ha lwz r5,tlb_44x_hwater@l(r4) 1: tlbwe r3,r3,PPC44x_TLB_PAGEID addi r3,r3,1 cmpw 0,r3,r5 ble 1b isync #elif defined(CONFIG_FSL_BOOKE) /* Invalidate all entries in TLB0 */ li r3, 0x04 tlbivax 0,3 /* Invalidate all entries in TLB1 */ li r3, 0x0c tlbivax 0,3 msync #ifdef CONFIG_SMP tlbsync #endif /* CONFIG_SMP */ #else /* !(CONFIG_40x || CONFIG_44x || CONFIG_FSL_BOOKE) */ #if defined(CONFIG_SMP) rlwinm r8,r1,0,0,(31-THREAD_SHIFT) lwz r8,TI_CPU(r8) oris r8,r8,10 mfmsr r10 SYNC rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ rlwinm r0,r0,0,28,26 /* clear DR */ mtmsr r0 SYNC_601 isync lis r9,mmu_hash_lock@h ori r9,r9,mmu_hash_lock@l tophys(r9,r9) 10: lwarx r7,0,r9 cmpwi 0,r7,0 bne- 10b stwcx. r8,0,r9 bne- 10b sync tlbia sync TLBSYNC li r0,0 stw r0,0(r9) /* clear mmu_hash_lock */ mtmsr r10 SYNC_601 isync #else /* CONFIG_SMP */ sync tlbia sync #endif /* CONFIG_SMP */ #endif /* ! defined(CONFIG_40x) */ blr /* * Flush MMU TLB for a particular address */ #ifndef CONFIG_FSL_BOOKE _GLOBAL(_tlbil_va) #endif _GLOBAL(_tlbie) #if defined(CONFIG_40x) /* We run the search with interrupts disabled because we have to change * the PID and I don't want to preempt when that happens. */ mfmsr r5 mfspr r6,SPRN_PID wrteei 0 mtspr SPRN_PID,r4 tlbsx. r3, 0, r3 mtspr SPRN_PID,r6 wrtee r5 bne 10f sync /* There are only 64 TLB entries, so r3 < 64, which means bit 25 is clear. * Since 25 is the V bit in the TLB_TAG, loading this value will invalidate * the TLB entry. */ tlbwe r3, r3, TLB_TAG isync 10: #elif defined(CONFIG_44x) mfspr r5,SPRN_MMUCR rlwimi r5,r4,0,24,31 /* Set TID */ /* We have to run the search with interrupts disabled, even critical * and debug interrupts (in fact the only critical exceptions we have * are debug and machine check). Otherwise an interrupt which causes * a TLB miss can clobber the MMUCR between the mtspr and the tlbsx. */ mfmsr r4 lis r6,(MSR_EE|MSR_CE|MSR_ME|MSR_DE)@ha addi r6,r6,(MSR_EE|MSR_CE|MSR_ME|MSR_DE)@l andc r6,r4,r6 mtmsr r6 mtspr SPRN_MMUCR,r5 tlbsx. r3, 0, r3 mtmsr r4 bne 10f sync /* There are only 64 TLB entries, so r3 < 64, * which means bit 22, is clear. Since 22 is * the V bit in the TLB_PAGEID, loading this * value will invalidate the TLB entry. */ tlbwe r3, r3, PPC44x_TLB_PAGEID isync 10: #elif defined(CONFIG_FSL_BOOKE) rlwinm r4, r3, 0, 0, 19 ori r5, r4, 0x08 /* TLBSEL = 1 */ tlbivax 0, r4 tlbivax 0, r5 msync #if defined(CONFIG_SMP) tlbsync #endif /* CONFIG_SMP */ #else /* !(CONFIG_40x || CONFIG_44x || CONFIG_FSL_BOOKE) */ #if defined(CONFIG_SMP) rlwinm r8,r1,0,0,(31-THREAD_SHIFT) lwz r8,TI_CPU(r8) oris r8,r8,11 mfmsr r10 SYNC rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */ rlwinm r0,r0,0,28,26 /* clear DR */ mtmsr r0 SYNC_601 isync lis r9,mmu_hash_lock@h ori r9,r9,mmu_hash_lock@l tophys(r9,r9) 10: lwarx r7,0,r9 cmpwi 0,r7,0 bne- 10b stwcx. r8,0,r9 bne- 10b eieio tlbie r3 sync TLBSYNC li r0,0 stw r0,0(r9) /* clear mmu_hash_lock */ mtmsr r10 SYNC_601 isync #else /* CONFIG_SMP */ tlbie r3 sync #endif /* CONFIG_SMP */ #endif /* ! CONFIG_40x */ blr #if defined(CONFIG_FSL_BOOKE) /* * Flush MMU TLB, but only on the local processor (no broadcast) */ _GLOBAL(_tlbil_all) #define MMUCSR0_TLBFI (MMUCSR0_TLB0FI | MMUCSR0_TLB1FI | \ MMUCSR0_TLB2FI | MMUCSR0_TLB3FI) li r3,(MMUCSR0_TLBFI)@l mtspr SPRN_MMUCSR0, r3 1: mfspr r3,SPRN_MMUCSR0 andi. r3,r3,MMUCSR0_TLBFI@l bne 1b blr /* * Flush MMU TLB for a particular process id, but only on the local processor * (no broadcast) */ _GLOBAL(_tlbil_pid) /* we currently do an invalidate all since we don't have per pid invalidate */ li r3,(MMUCSR0_TLBFI)@l mtspr SPRN_MMUCSR0, r3 1: mfspr r3,SPRN_MMUCSR0 andi. r3,r3,MMUCSR0_TLBFI@l bne 1b msync isync blr /* * Flush MMU TLB for a particular address, but only on the local processor * (no broadcast) */ _GLOBAL(_tlbil_va) mfmsr r10 wrteei 0 slwi r4,r4,16 mtspr SPRN_MAS6,r4 /* assume AS=0 for now */ tlbsx 0,r3 mfspr r4,SPRN_MAS1 /* check valid */ andis. r3,r4,MAS1_VALID@h beq 1f rlwinm r4,r4,0,1,31 mtspr SPRN_MAS1,r4 tlbwe msync isync 1: wrtee r10 blr #endif /* CONFIG_FSL_BOOKE */ /* * Nobody implements this yet */ _GLOBAL(_tlbivax_bcast) 1: trap EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; blr /* * Flush instruction cache. * This is a no-op on the 601. */ _GLOBAL(flush_instruction_cache) #if defined(CONFIG_8xx) isync lis r5, IDC_INVALL@h mtspr SPRN_IC_CST, r5 #elif defined(CONFIG_4xx) #ifdef CONFIG_403GCX li r3, 512 mtctr r3 lis r4, KERNELBASE@h 1: iccci 0, r4 addi r4, r4, 16 bdnz 1b #else lis r3, KERNELBASE@h iccci 0,r3 #endif #elif CONFIG_FSL_BOOKE BEGIN_FTR_SECTION mfspr r3,SPRN_L1CSR0 ori r3,r3,L1CSR0_CFI|L1CSR0_CLFC /* msync; isync recommended here */ mtspr SPRN_L1CSR0,r3 isync blr END_FTR_SECTION_IFSET(CPU_FTR_UNIFIED_ID_CACHE) mfspr r3,SPRN_L1CSR1 ori r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR mtspr SPRN_L1CSR1,r3 #else mfspr r3,SPRN_PVR rlwinm r3,r3,16,16,31 cmpwi 0,r3,1 beqlr /* for 601, do nothing */ /* 603/604 processor - use invalidate-all bit in HID0 */ mfspr r3,SPRN_HID0 ori r3,r3,HID0_ICFI mtspr SPRN_HID0,r3 #endif /* CONFIG_8xx/4xx */ isync blr /* * Write any modified data cache blocks out to memory * and invalidate the corresponding instruction cache blocks. * This is a no-op on the 601. * * flush_icache_range(unsigned long start, unsigned long stop) */ _KPROBE(__flush_icache_range) BEGIN_FTR_SECTION blr /* for 601, do nothing */ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) li r5,L1_CACHE_BYTES-1 andc r3,r3,r5 subf r4,r3,r4 add r4,r4,r5 srwi. r4,r4,L1_CACHE_SHIFT beqlr mtctr r4 mr r6,r3 1: dcbst 0,r3 addi r3,r3,L1_CACHE_BYTES bdnz 1b sync /* wait for dcbst's to get to ram */ mtctr r4 2: icbi 0,r6 addi r6,r6,L1_CACHE_BYTES bdnz 2b sync /* additional sync needed on g4 */ isync blr /* * Write any modified data cache blocks out to memory. * Does not invalidate the corresponding cache lines (especially for * any corresponding instruction cache). * * clean_dcache_range(unsigned long start, unsigned long stop) */ _GLOBAL(clean_dcache_range) li r5,L1_CACHE_BYTES-1 andc r3,r3,r5 subf r4,r3,r4 add r4,r4,r5 srwi. r4,r4,L1_CACHE_SHIFT beqlr mtctr r4 1: dcbst 0,r3 addi r3,r3,L1_CACHE_BYTES bdnz 1b sync /* wait for dcbst's to get to ram */ blr /* * Write any modified data cache blocks out to memory and invalidate them. * Does not invalidate the corresponding instruction cache blocks. * * flush_dcache_range(unsigned long start, unsigned long stop) */ _GLOBAL(flush_dcache_range) li r5,L1_CACHE_BYTES-1 andc r3,r3,r5 subf r4,r3,r4 add r4,r4,r5 srwi. r4,r4,L1_CACHE_SHIFT beqlr mtctr r4 1: dcbf 0,r3 addi r3,r3,L1_CACHE_BYTES bdnz 1b sync /* wait for dcbst's to get to ram */ blr /* * Like above, but invalidate the D-cache. This is used by the 8xx * to invalidate the cache so the PPC core doesn't get stale data * from the CPM (no cache snooping here :-). * * invalidate_dcache_range(unsigned long start, unsigned long stop) */ _GLOBAL(invalidate_dcache_range) li r5,L1_CACHE_BYTES-1 andc r3,r3,r5 subf r4,r3,r4 add r4,r4,r5 srwi. r4,r4,L1_CACHE_SHIFT beqlr mtctr r4 1: dcbi 0,r3 addi r3,r3,L1_CACHE_BYTES bdnz 1b sync /* wait for dcbi's to get to ram */ blr /* * Flush a particular page from the data cache to RAM. * Note: this is necessary because the instruction cache does *not* * snoop from the data cache. * This is a no-op on the 601 which has a unified cache. * * void __flush_dcache_icache(void *page) */ _GLOBAL(__flush_dcache_icache) BEGIN_FTR_SECTION blr END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) rlwinm r3,r3,0,0,19 /* Get page base address */ li r4,4096/L1_CACHE_BYTES /* Number of lines in a page */ mtctr r4 mr r6,r3 0: dcbst 0,r3 /* Write line to ram */ addi r3,r3,L1_CACHE_BYTES bdnz 0b sync #ifndef CONFIG_44x /* We don't flush the icache on 44x. Those have a virtual icache * and we don't have access to the virtual address here (it's * not the page vaddr but where it's mapped in user space). The * flushing of the icache on these is handled elsewhere, when * a change in the address space occurs, before returning to * user space */ mtctr r4 1: icbi 0,r6 addi r6,r6,L1_CACHE_BYTES bdnz 1b sync isync #endif /* CONFIG_44x */ blr /* * Flush a particular page from the data cache to RAM, identified * by its physical address. We turn off the MMU so we can just use * the physical address (this may be a highmem page without a kernel * mapping). * * void __flush_dcache_icache_phys(unsigned long physaddr) */ _GLOBAL(__flush_dcache_icache_phys) BEGIN_FTR_SECTION blr /* for 601, do nothing */ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) mfmsr r10 rlwinm r0,r10,0,28,26 /* clear DR */ mtmsr r0 isync rlwinm r3,r3,0,0,19 /* Get page base address */ li r4,4096/L1_CACHE_BYTES /* Number of lines in a page */ mtctr r4 mr r6,r3 0: dcbst 0,r3 /* Write line to ram */ addi r3,r3,L1_CACHE_BYTES bdnz 0b sync mtctr r4 1: icbi 0,r6 addi r6,r6,L1_CACHE_BYTES bdnz 1b sync mtmsr r10 /* restore DR */ isync blr /* * Clear pages using the dcbz instruction, which doesn't cause any * memory traffic (except to write out any cache lines which get * displaced). This only works on cacheable memory. * * void clear_pages(void *page, int order) ; */ _GLOBAL(clear_pages) li r0,4096/L1_CACHE_BYTES slw r0,r0,r4 mtctr r0 #ifdef CONFIG_8xx li r4, 0 1: stw r4, 0(r3) stw r4, 4(r3) stw r4, 8(r3) stw r4, 12(r3) #else 1: dcbz 0,r3 #endif addi r3,r3,L1_CACHE_BYTES bdnz 1b blr /* * Copy a whole page. We use the dcbz instruction on the destination * to reduce memory traffic (it eliminates the unnecessary reads of * the destination into cache). This requires that the destination * is cacheable. */ #define COPY_16_BYTES \ lwz r6,4(r4); \ lwz r7,8(r4); \ lwz r8,12(r4); \ lwzu r9,16(r4); \ stw r6,4(r3); \ stw r7,8(r3); \ stw r8,12(r3); \ stwu r9,16(r3) _GLOBAL(copy_page) addi r3,r3,-4 addi r4,r4,-4 #ifdef CONFIG_8xx /* don't use prefetch on 8xx */ li r0,4096/L1_CACHE_BYTES mtctr r0 1: COPY_16_BYTES bdnz 1b blr #else /* not 8xx, we can prefetch */ li r5,4 #if MAX_COPY_PREFETCH > 1 li r0,MAX_COPY_PREFETCH li r11,4 mtctr r0 11: dcbt r11,r4 addi r11,r11,L1_CACHE_BYTES bdnz 11b #else /* MAX_COPY_PREFETCH == 1 */ dcbt r5,r4 li r11,L1_CACHE_BYTES+4 #endif /* MAX_COPY_PREFETCH */ li r0,4096/L1_CACHE_BYTES - MAX_COPY_PREFETCH crclr 4*cr0+eq 2: mtctr r0 1: dcbt r11,r4 dcbz r5,r3 COPY_16_BYTES #if L1_CACHE_BYTES >= 32 COPY_16_BYTES #if L1_CACHE_BYTES >= 64 COPY_16_BYTES COPY_16_BYTES #if L1_CACHE_BYTES >= 128 COPY_16_BYTES COPY_16_BYTES COPY_16_BYTES COPY_16_BYTES #endif #endif #endif bdnz 1b beqlr crnot 4*cr0+eq,4*cr0+eq li r0,MAX_COPY_PREFETCH li r11,4 b 2b #endif /* CONFIG_8xx */ /* * void atomic_clear_mask(atomic_t mask, atomic_t *addr) * void atomic_set_mask(atomic_t mask, atomic_t *addr); */ _GLOBAL(atomic_clear_mask) 10: lwarx r5,0,r4 andc r5,r5,r3 PPC405_ERR77(0,r4) stwcx. r5,0,r4 bne- 10b blr _GLOBAL(atomic_set_mask) 10: lwarx r5,0,r4 or r5,r5,r3 PPC405_ERR77(0,r4) stwcx. r5,0,r4 bne- 10b blr /* * Extended precision shifts. * * Updated to be valid for shift counts from 0 to 63 inclusive. * -- Gabriel * * R3/R4 has 64 bit value * R5 has shift count * result in R3/R4 * * ashrdi3: arithmetic right shift (sign propagation) * lshrdi3: logical right shift * ashldi3: left shift */ _GLOBAL(__ashrdi3) subfic r6,r5,32 srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count addi r7,r5,32 # could be xori, or addi with -32 slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0 sraw r7,r3,r7 # t2 = MSW >> (count-32) or r4,r4,r6 # LSW |= t1 slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2 sraw r3,r3,r5 # MSW = MSW >> count or r4,r4,r7 # LSW |= t2 blr _GLOBAL(__ashldi3) subfic r6,r5,32 slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count addi r7,r5,32 # could be xori, or addi with -32 srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count) slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32) or r3,r3,r6 # MSW |= t1 slw r4,r4,r5 # LSW = LSW << count or r3,r3,r7 # MSW |= t2 blr _GLOBAL(__lshrdi3) subfic r6,r5,32 srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count addi r7,r5,32 # could be xori, or addi with -32 slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count) srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32) or r4,r4,r6 # LSW |= t1 srw r3,r3,r5 # MSW = MSW >> count or r4,r4,r7 # LSW |= t2 blr /* * 64-bit comparison: __ucmpdi2(u64 a, u64 b) * Returns 0 if a < b, 1 if a == b, 2 if a > b. */ _GLOBAL(__ucmpdi2) cmplw r3,r5 li r3,1 bne 1f cmplw r4,r6 beqlr 1: li r3,0 bltlr li r3,2 blr _GLOBAL(abs) srawi r4,r3,31 xor r3,r3,r4 sub r3,r3,r4 blr /* * Create a kernel thread * kernel_thread(fn, arg, flags) */ _GLOBAL(kernel_thread) stwu r1,-16(r1) stw r30,8(r1) stw r31,12(r1) mr r30,r3 /* function */ mr r31,r4 /* argument */ ori r3,r5,CLONE_VM /* flags */ oris r3,r3,CLONE_UNTRACED>>16 li r4,0 /* new sp (unused) */ li r0,__NR_clone sc bns+ 1f /* did system call indicate error? */ neg r3,r3 /* if so, make return code negative */ 1: cmpwi 0,r3,0 /* parent or child? */ bne 2f /* return if parent */ li r0,0 /* make top-level stack frame */ stwu r0,-16(r1) mtlr r30 /* fn addr in lr */ mr r3,r31 /* load arg and call fn */ PPC440EP_ERR42 blrl li r0,__NR_exit /* exit if function returns */ li r3,0 sc 2: lwz r30,8(r1) lwz r31,12(r1) addi r1,r1,16 blr /* * This routine is just here to keep GCC happy - sigh... */ _GLOBAL(__main) blr #ifdef CONFIG_KEXEC /* * Must be relocatable PIC code callable as a C function. */ .globl relocate_new_kernel relocate_new_kernel: /* r3 = page_list */ /* r4 = reboot_code_buffer */ /* r5 = start_address */ li r0, 0 /* * Set Machine Status Register to a known status, * switch the MMU off and jump to 1: in a single step. */ mr r8, r0 ori r8, r8, MSR_RI|MSR_ME mtspr SPRN_SRR1, r8 addi r8, r4, 1f - relocate_new_kernel mtspr SPRN_SRR0, r8 sync rfi 1: /* from this point address translation is turned off */ /* and interrupts are disabled */ /* set a new stack at the bottom of our page... */ /* (not really needed now) */ addi r1, r4, KEXEC_CONTROL_PAGE_SIZE - 8 /* for LR Save+Back Chain */ stw r0, 0(r1) /* Do the copies */ li r6, 0 /* checksum */ mr r0, r3 b 1f 0: /* top, read another word for the indirection page */ lwzu r0, 4(r3) 1: /* is it a destination page? (r8) */ rlwinm. r7, r0, 0, 31, 31 /* IND_DESTINATION (1<<0) */ beq 2f rlwinm r8, r0, 0, 0, 19 /* clear kexec flags, page align */ b 0b 2: /* is it an indirection page? (r3) */ rlwinm. r7, r0, 0, 30, 30 /* IND_INDIRECTION (1<<1) */ beq 2f rlwinm r3, r0, 0, 0, 19 /* clear kexec flags, page align */ subi r3, r3, 4 b 0b 2: /* are we done? */ rlwinm. r7, r0, 0, 29, 29 /* IND_DONE (1<<2) */ beq 2f b 3f 2: /* is it a source page? (r9) */ rlwinm. r7, r0, 0, 28, 28 /* IND_SOURCE (1<<3) */ beq 0b rlwinm r9, r0, 0, 0, 19 /* clear kexec flags, page align */ li r7, PAGE_SIZE / 4 mtctr r7 subi r9, r9, 4 subi r8, r8, 4 9: lwzu r0, 4(r9) /* do the copy */ xor r6, r6, r0 stwu r0, 4(r8) dcbst 0, r8 sync icbi 0, r8 bdnz 9b addi r9, r9, 4 addi r8, r8, 4 b 0b 3: /* To be certain of avoiding problems with self-modifying code * execute a serializing instruction here. */ isync sync /* jump to the entry point, usually the setup routine */ mtlr r5 blrl 1: b 1b relocate_new_kernel_end: .globl relocate_new_kernel_size relocate_new_kernel_size: .long relocate_new_kernel_end - relocate_new_kernel #endif