| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * 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. |
| * |
| */ |
| |
| #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/bug.h> |
| #include <asm/ptrace.h> |
| #include <asm/export.h> |
| #include <asm/feature-fixups.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) |
| stw r3, THREAD+KSP_LIMIT(r2) |
| stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) |
| mr r1,r3 |
| stw r10,8(r1) |
| 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, void *sp); |
| */ |
| _GLOBAL(call_do_irq) |
| mflr r0 |
| stw r0,4(r1) |
| lwz r10,THREAD+KSP_LIMIT(r2) |
| stw r4, THREAD+KSP_LIMIT(r2) |
| stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4) |
| mr r1,r4 |
| stw r10,8(r1) |
| 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 */ |
| mullw r9,r3,r5 |
| mulhwu r10,r3,r5 |
| beq 2f |
| mullw r0,r3,r6 |
| mulhwu r8,r3,r6 |
| addc r7,r0,r7 |
| adde r4,r4,r8 |
| addze r10,r10 |
| 2: addc r4,r4,r9 |
| addze r3,r10 |
| 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_PPC_BOOK3S_32) |
| |
| /* 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 |
| |
| #ifdef CONFIG_SMP |
| /* Store new HID1 image */ |
| lwz r6,TASK_CPU(r2) |
| slwi r6,r6,2 |
| #else |
| li r6, 0 |
| #endif |
| 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_PPC_BOOK3S_32 */ |
| |
| #ifdef CONFIG_40x |
| |
| /* |
| * Do an IO access in real mode |
| */ |
| _GLOBAL(real_readb) |
| mfmsr r7 |
| rlwinm r0,r7,0,~MSR_DR |
| sync |
| mtmsr r0 |
| sync |
| isync |
| lbz r3,0(r3) |
| sync |
| mtmsr r7 |
| sync |
| isync |
| blr |
| _ASM_NOKPROBE_SYMBOL(real_readb) |
| |
| /* |
| * Do an IO access in real mode |
| */ |
| _GLOBAL(real_writeb) |
| mfmsr r7 |
| rlwinm r0,r7,0,~MSR_DR |
| sync |
| mtmsr r0 |
| sync |
| isync |
| stb r3,0(r4) |
| sync |
| mtmsr r7 |
| sync |
| isync |
| blr |
| _ASM_NOKPROBE_SYMBOL(real_writeb) |
| |
| #endif /* CONFIG_40x */ |
| |
| /* |
| * 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) |
| rlwinm r5, r3, 0, L1_CACHE_BYTES - 1 |
| addi r3,r3,-4 |
| |
| 0: twnei r5, 0 /* WARN if r3 is not cache aligned */ |
| EMIT_BUG_ENTRY 0b,__FILE__,__LINE__, BUGFLAG_WARNING |
| |
| 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 |
| EXPORT_SYMBOL(copy_page) |
| |
| /* |
| * 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 |
| EXPORT_SYMBOL(__ashrdi3) |
| |
| _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 |
| EXPORT_SYMBOL(__ashldi3) |
| |
| _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 |
| EXPORT_SYMBOL(__lshrdi3) |
| |
| /* |
| * 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 |
| EXPORT_SYMBOL(__cmpdi2) |
| /* |
| * 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 |
| EXPORT_SYMBOL(__ucmpdi2) |
| |
| _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 |
| EXPORT_SYMBOL(__bswapdi2) |
| |
| #ifdef CONFIG_SMP |
| _GLOBAL(start_secondary_resume) |
| /* Reset stack */ |
| rlwinm r1, r1, 0, 0, 31 - THREAD_SHIFT |
| 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 |
