| /* |
| * 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 <ebiederm@xmission.com> |
| * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz |
| * PPC44x port. Copyright (C) 2011, IBM Corporation |
| * Author: Suzuki Poulose <suzuki@in.ibm.com> |
| * |
| * 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 <linux/sys.h> |
| #include <asm/unistd.h> |
| #include <asm/errno.h> |
| #include <asm/reg.h> |
| #include <asm/page.h> |
| #include <asm/cache.h> |
| #include <asm/cputable.h> |
| #include <asm/mmu.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/thread_info.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/processor.h> |
| #include <asm/kexec.h> |
| #include <asm/bug.h> |
| #include <asm/ptrace.h> |
| |
| .text |
| |
| /* |
| * We store the saved ksp_limit in the unused part |
| * of the STACK_FRAME_OVERHEAD |
| */ |
| _GLOBAL(call_do_softirq) |
| mflr r0 |
| stw r0,4(r1) |
| lwz r10,THREAD+KSP_LIMIT(r2) |
| addi r11,r3,THREAD_INFO_GAP |
| stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) |
| mr r1,r3 |
| stw r10,8(r1) |
| stw r11,THREAD+KSP_LIMIT(r2) |
| bl __do_softirq |
| lwz r10,8(r1) |
| lwz r1,0(r1) |
| lwz r0,4(r1) |
| stw r10,THREAD+KSP_LIMIT(r2) |
| mtlr r0 |
| blr |
| |
| /* |
| * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp); |
| */ |
| _GLOBAL(call_do_irq) |
| mflr r0 |
| stw r0,4(r1) |
| lwz r10,THREAD+KSP_LIMIT(r2) |
| addi r11,r4,THREAD_INFO_GAP |
| stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4) |
| mr r1,r4 |
| stw r10,8(r1) |
| stw r11,THREAD+KSP_LIMIT(r2) |
| bl __do_irq |
| lwz r10,8(r1) |
| lwz r1,0(r1) |
| lwz r0,4(r1) |
| stw r10,THREAD+KSP_LIMIT(r2) |
| mtlr r0 |
| blr |
| |
| /* |
| * 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 */ |
| CURRENT_THREAD_INFO(r6, r1) |
| 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 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 |
| PURGE_PREFETCHED_INS |
| 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 */ |
| #ifndef CONFIG_44x |
| mtctr r4 |
| 2: icbi 0,r6 |
| addi r6,r6,L1_CACHE_BYTES |
| bdnz 2b |
| #else |
| /* Flash invalidate on 44x because we are passed kmapped addresses and |
| this doesn't work for userspace pages due to the virtually tagged |
| icache. Sigh. */ |
| iccci 0, r0 |
| #endif |
| 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 |
| PURGE_PREFETCHED_INS |
| blr |
| END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) |
| rlwinm r3,r3,0,0,31-PAGE_SHIFT /* Get page base address */ |
| li r4,PAGE_SIZE/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 |
| #ifdef 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 |
| */ |
| BEGIN_MMU_FTR_SECTION |
| blr |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_44x) |
| #endif /* CONFIG_44x */ |
| mtctr r4 |
| 1: icbi 0,r6 |
| addi r6,r6,L1_CACHE_BYTES |
| bdnz 1b |
| sync |
| isync |
| blr |
| |
| #ifndef CONFIG_BOOKE |
| /* |
| * 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 |
| PURGE_PREFETCHED_INS |
| 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,r3,0,0,31-PAGE_SHIFT /* Get page base address */ |
| li r4,PAGE_SIZE/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 |
| #endif /* CONFIG_BOOKE */ |
| |
| /* |
| * 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,PAGE_SIZE/L1_CACHE_BYTES |
| slw r0,r0,r4 |
| mtctr r0 |
| 1: dcbz 0,r3 |
| 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 |
| |
| 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,PAGE_SIZE/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 |
| |
| /* |
| * 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: __cmpdi2(s64 a, s64 b) |
| * Returns 0 if a < b, 1 if a == b, 2 if a > b. |
| */ |
| _GLOBAL(__cmpdi2) |
| cmpw r3,r5 |
| li r3,1 |
| bne 1f |
| cmplw r4,r6 |
| beqlr |
| 1: li r3,0 |
| bltlr |
| li r3,2 |
| 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(__bswapdi2) |
| rotlwi r9,r4,8 |
| rotlwi r10,r3,8 |
| rlwimi r9,r4,24,0,7 |
| rlwimi r10,r3,24,0,7 |
| rlwimi r9,r4,24,16,23 |
| rlwimi r10,r3,24,16,23 |
| mr r3,r9 |
| mr r4,r10 |
| blr |
| |
| _GLOBAL(abs) |
| srawi r4,r3,31 |
| xor r3,r3,r4 |
| sub r3,r3,r4 |
| blr |
| |
| #ifdef CONFIG_SMP |
| _GLOBAL(start_secondary_resume) |
| /* Reset stack */ |
| CURRENT_THREAD_INFO(r1, r1) |
| addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD |
| li r3,0 |
| stw r3,0(r1) /* Zero the stack frame pointer */ |
| bl start_secondary |
| b . |
| #endif /* CONFIG_SMP */ |
| |
| /* |
| * 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 */ |
| |
| #ifdef CONFIG_FSL_BOOKE |
| |
| mr r29, r3 |
| mr r30, r4 |
| mr r31, r5 |
| |
| #define ENTRY_MAPPING_KEXEC_SETUP |
| #include "fsl_booke_entry_mapping.S" |
| #undef ENTRY_MAPPING_KEXEC_SETUP |
| |
| mr r3, r29 |
| mr r4, r30 |
| mr r5, r31 |
| |
| li r0, 0 |
| #elif defined(CONFIG_44x) |
| |
| /* Save our parameters */ |
| mr r29, r3 |
| mr r30, r4 |
| mr r31, r5 |
| |
| #ifdef CONFIG_PPC_47x |
| /* Check for 47x cores */ |
| mfspr r3,SPRN_PVR |
| srwi r3,r3,16 |
| cmplwi cr0,r3,PVR_476FPE@h |
| beq setup_map_47x |
| cmplwi cr0,r3,PVR_476@h |
| beq setup_map_47x |
| cmplwi cr0,r3,PVR_476_ISS@h |
| beq setup_map_47x |
| #endif /* CONFIG_PPC_47x */ |
| |
| /* |
| * Code for setting up 1:1 mapping for PPC440x for KEXEC |
| * |
| * We cannot switch off the MMU on PPC44x. |
| * So we: |
| * 1) Invalidate all the mappings except the one we are running from. |
| * 2) Create a tmp mapping for our code in the other address space(TS) and |
| * jump to it. Invalidate the entry we started in. |
| * 3) Create a 1:1 mapping for 0-2GiB in chunks of 256M in original TS. |
| * 4) Jump to the 1:1 mapping in original TS. |
| * 5) Invalidate the tmp mapping. |
| * |
| * - Based on the kexec support code for FSL BookE |
| * |
| */ |
| |
| /* |
| * Load the PID with kernel PID (0). |
| * Also load our MSR_IS and TID to MMUCR for TLB search. |
| */ |
| li r3, 0 |
| mtspr SPRN_PID, r3 |
| mfmsr r4 |
| andi. r4,r4,MSR_IS@l |
| beq wmmucr |
| oris r3,r3,PPC44x_MMUCR_STS@h |
| wmmucr: |
| mtspr SPRN_MMUCR,r3 |
| sync |
| |
| /* |
| * Invalidate all the TLB entries except the current entry |
| * where we are running from |
| */ |
| bl 0f /* Find our address */ |
| 0: mflr r5 /* Make it accessible */ |
| tlbsx r23,0,r5 /* Find entry we are in */ |
| li r4,0 /* Start at TLB entry 0 */ |
| li r3,0 /* Set PAGEID inval value */ |
| 1: cmpw r23,r4 /* Is this our entry? */ |
| beq skip /* If so, skip the inval */ |
| tlbwe r3,r4,PPC44x_TLB_PAGEID /* If not, inval the entry */ |
| skip: |
| addi r4,r4,1 /* Increment */ |
| cmpwi r4,64 /* Are we done? */ |
| bne 1b /* If not, repeat */ |
| isync |
| |
| /* Create a temp mapping and jump to it */ |
| andi. r6, r23, 1 /* Find the index to use */ |
| addi r24, r6, 1 /* r24 will contain 1 or 2 */ |
| |
| mfmsr r9 /* get the MSR */ |
| rlwinm r5, r9, 27, 31, 31 /* Extract the MSR[IS] */ |
| xori r7, r5, 1 /* Use the other address space */ |
| |
| /* Read the current mapping entries */ |
| tlbre r3, r23, PPC44x_TLB_PAGEID |
| tlbre r4, r23, PPC44x_TLB_XLAT |
| tlbre r5, r23, PPC44x_TLB_ATTRIB |
| |
| /* Save our current XLAT entry */ |
| mr r25, r4 |
| |
| /* Extract the TLB PageSize */ |
| li r10, 1 /* r10 will hold PageSize */ |
| rlwinm r11, r3, 0, 24, 27 /* bits 24-27 */ |
| |
| /* XXX: As of now we use 256M, 4K pages */ |
| cmpwi r11, PPC44x_TLB_256M |
| bne tlb_4k |
| rotlwi r10, r10, 28 /* r10 = 256M */ |
| b write_out |
| tlb_4k: |
| cmpwi r11, PPC44x_TLB_4K |
| bne default |
| rotlwi r10, r10, 12 /* r10 = 4K */ |
| b write_out |
| default: |
| rotlwi r10, r10, 10 /* r10 = 1K */ |
| |
| write_out: |
| /* |
| * Write out the tmp 1:1 mapping for this code in other address space |
| * Fixup EPN = RPN , TS=other address space |
| */ |
| insrwi r3, r7, 1, 23 /* Bit 23 is TS for PAGEID field */ |
| |
| /* Write out the tmp mapping entries */ |
| tlbwe r3, r24, PPC44x_TLB_PAGEID |
| tlbwe r4, r24, PPC44x_TLB_XLAT |
| tlbwe r5, r24, PPC44x_TLB_ATTRIB |
| |
| subi r11, r10, 1 /* PageOffset Mask = PageSize - 1 */ |
| not r10, r11 /* Mask for PageNum */ |
| |
| /* Switch to other address space in MSR */ |
| insrwi r9, r7, 1, 26 /* Set MSR[IS] = r7 */ |
| |
| bl 1f |
| 1: mflr r8 |
| addi r8, r8, (2f-1b) /* Find the target offset */ |
| |
| /* Jump to the tmp mapping */ |
| mtspr SPRN_SRR0, r8 |
| mtspr SPRN_SRR1, r9 |
| rfi |
| |
| 2: |
| /* Invalidate the entry we were executing from */ |
| li r3, 0 |
| tlbwe r3, r23, PPC44x_TLB_PAGEID |
| |
| /* attribute fields. rwx for SUPERVISOR mode */ |
| li r5, 0 |
| ori r5, r5, (PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_SX | PPC44x_TLB_G) |
| |
| /* Create 1:1 mapping in 256M pages */ |
| xori r7, r7, 1 /* Revert back to Original TS */ |
| |
| li r8, 0 /* PageNumber */ |
| li r6, 3 /* TLB Index, start at 3 */ |
| |
| next_tlb: |
| rotlwi r3, r8, 28 /* Create EPN (bits 0-3) */ |
| mr r4, r3 /* RPN = EPN */ |
| ori r3, r3, (PPC44x_TLB_VALID | PPC44x_TLB_256M) /* SIZE = 256M, Valid */ |
| insrwi r3, r7, 1, 23 /* Set TS from r7 */ |
| |
| tlbwe r3, r6, PPC44x_TLB_PAGEID /* PageID field : EPN, V, SIZE */ |
| tlbwe r4, r6, PPC44x_TLB_XLAT /* Address translation : RPN */ |
| tlbwe r5, r6, PPC44x_TLB_ATTRIB /* Attributes */ |
| |
| addi r8, r8, 1 /* Increment PN */ |
| addi r6, r6, 1 /* Increment TLB Index */ |
| cmpwi r8, 8 /* Are we done ? */ |
| bne next_tlb |
| isync |
| |
| /* Jump to the new mapping 1:1 */ |
| li r9,0 |
| insrwi r9, r7, 1, 26 /* Set MSR[IS] = r7 */ |
| |
| bl 1f |
| 1: mflr r8 |
| and r8, r8, r11 /* Get our offset within page */ |
| addi r8, r8, (2f-1b) |
| |
| and r5, r25, r10 /* Get our target PageNum */ |
| or r8, r8, r5 /* Target jump address */ |
| |
| mtspr SPRN_SRR0, r8 |
| mtspr SPRN_SRR1, r9 |
| rfi |
| 2: |
| /* Invalidate the tmp entry we used */ |
| li r3, 0 |
| tlbwe r3, r24, PPC44x_TLB_PAGEID |
| sync |
| b ppc44x_map_done |
| |
| #ifdef CONFIG_PPC_47x |
| |
| /* 1:1 mapping for 47x */ |
| |
| setup_map_47x: |
| |
| /* |
| * Load the kernel pid (0) to PID and also to MMUCR[TID]. |
| * Also set the MSR IS->MMUCR STS |
| */ |
| li r3, 0 |
| mtspr SPRN_PID, r3 /* Set PID */ |
| mfmsr r4 /* Get MSR */ |
| andi. r4, r4, MSR_IS@l /* TS=1? */ |
| beq 1f /* If not, leave STS=0 */ |
| oris r3, r3, PPC47x_MMUCR_STS@h /* Set STS=1 */ |
| 1: mtspr SPRN_MMUCR, r3 /* Put MMUCR */ |
| sync |
| |
| /* Find the entry we are running from */ |
| bl 2f |
| 2: mflr r23 |
| tlbsx r23, 0, r23 |
| tlbre r24, r23, 0 /* TLB Word 0 */ |
| tlbre r25, r23, 1 /* TLB Word 1 */ |
| tlbre r26, r23, 2 /* TLB Word 2 */ |
| |
| |
| /* |
| * Invalidates all the tlb entries by writing to 256 RPNs(r4) |
| * of 4k page size in all 4 ways (0-3 in r3). |
| * This would invalidate the entire UTLB including the one we are |
| * running from. However the shadow TLB entries would help us |
| * to continue the execution, until we flush them (rfi/isync). |
| */ |
| addis r3, 0, 0x8000 /* specify the way */ |
| addi r4, 0, 0 /* TLB Word0 = (EPN=0, VALID = 0) */ |
| addi r5, 0, 0 |
| b clear_utlb_entry |
| |
| /* Align the loop to speed things up. from head_44x.S */ |
| .align 6 |
| |
| clear_utlb_entry: |
| |
| tlbwe r4, r3, 0 |
| tlbwe r5, r3, 1 |
| tlbwe r5, r3, 2 |
| addis r3, r3, 0x2000 /* Increment the way */ |
| cmpwi r3, 0 |
| bne clear_utlb_entry |
| addis r3, 0, 0x8000 |
| addis r4, r4, 0x100 /* Increment the EPN */ |
| cmpwi r4, 0 |
| bne clear_utlb_entry |
| |
| /* Create the entries in the other address space */ |
| mfmsr r5 |
| rlwinm r7, r5, 27, 31, 31 /* Get the TS (Bit 26) from MSR */ |
| xori r7, r7, 1 /* r7 = !TS */ |
| |
| insrwi r24, r7, 1, 21 /* Change the TS in the saved TLB word 0 */ |
| |
| /* |
| * write out the TLB entries for the tmp mapping |
| * Use way '0' so that we could easily invalidate it later. |
| */ |
| lis r3, 0x8000 /* Way '0' */ |
| |
| tlbwe r24, r3, 0 |
| tlbwe r25, r3, 1 |
| tlbwe r26, r3, 2 |
| |
| /* Update the msr to the new TS */ |
| insrwi r5, r7, 1, 26 |
| |
| bl 1f |
| 1: mflr r6 |
| addi r6, r6, (2f-1b) |
| |
| mtspr SPRN_SRR0, r6 |
| mtspr SPRN_SRR1, r5 |
| rfi |
| |
| /* |
| * Now we are in the tmp address space. |
| * Create a 1:1 mapping for 0-2GiB in the original TS. |
| */ |
| 2: |
| li r3, 0 |
| li r4, 0 /* TLB Word 0 */ |
| li r5, 0 /* TLB Word 1 */ |
| li r6, 0 |
| ori r6, r6, PPC47x_TLB2_S_RWX /* TLB word 2 */ |
| |
| li r8, 0 /* PageIndex */ |
| |
| xori r7, r7, 1 /* revert back to original TS */ |
| |
| write_utlb: |
| rotlwi r5, r8, 28 /* RPN = PageIndex * 256M */ |
| /* ERPN = 0 as we don't use memory above 2G */ |
| |
| mr r4, r5 /* EPN = RPN */ |
| ori r4, r4, (PPC47x_TLB0_VALID | PPC47x_TLB0_256M) |
| insrwi r4, r7, 1, 21 /* Insert the TS to Word 0 */ |
| |
| tlbwe r4, r3, 0 /* Write out the entries */ |
| tlbwe r5, r3, 1 |
| tlbwe r6, r3, 2 |
| addi r8, r8, 1 |
| cmpwi r8, 8 /* Have we completed ? */ |
| bne write_utlb |
| |
| /* make sure we complete the TLB write up */ |
| isync |
| |
| /* |
| * Prepare to jump to the 1:1 mapping. |
| * 1) Extract page size of the tmp mapping |
| * DSIZ = TLB_Word0[22:27] |
| * 2) Calculate the physical address of the address |
| * to jump to. |
| */ |
| rlwinm r10, r24, 0, 22, 27 |
| |
| cmpwi r10, PPC47x_TLB0_4K |
| bne 0f |
| li r10, 0x1000 /* r10 = 4k */ |
| bl 1f |
| |
| 0: |
| /* Defaults to 256M */ |
| lis r10, 0x1000 |
| |
| bl 1f |
| 1: mflr r4 |
| addi r4, r4, (2f-1b) /* virtual address of 2f */ |
| |
| subi r11, r10, 1 /* offsetmask = Pagesize - 1 */ |
| not r10, r11 /* Pagemask = ~(offsetmask) */ |
| |
| and r5, r25, r10 /* Physical page */ |
| and r6, r4, r11 /* offset within the current page */ |
| |
| or r5, r5, r6 /* Physical address for 2f */ |
| |
| /* Switch the TS in MSR to the original one */ |
| mfmsr r8 |
| insrwi r8, r7, 1, 26 |
| |
| mtspr SPRN_SRR1, r8 |
| mtspr SPRN_SRR0, r5 |
| rfi |
| |
| 2: |
| /* Invalidate the tmp mapping */ |
| lis r3, 0x8000 /* Way '0' */ |
| |
| clrrwi r24, r24, 12 /* Clear the valid bit */ |
| tlbwe r24, r3, 0 |
| tlbwe r25, r3, 1 |
| tlbwe r26, r3, 2 |
| |
| /* Make sure we complete the TLB write and flush the shadow TLB */ |
| isync |
| |
| #endif |
| |
| ppc44x_map_done: |
| |
| |
| /* Restore the parameters */ |
| mr r3, r29 |
| mr r4, r30 |
| mr r5, r31 |
| |
| li r0, 0 |
| #else |
| 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: |
| #endif |
| /* 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 |
| |
| mfspr r3, SPRN_PIR /* current core we are running on */ |
| mr r4, r5 /* load physical address of chunk called */ |
| |
| /* 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 |
