| /* |
| * 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. |
| * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) |
| * PPC64 updates by Dave Engebretsen (engebret@us.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/processor.h> |
| #include <asm/page.h> |
| #include <asm/cache.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/cputable.h> |
| #include <asm/thread_info.h> |
| |
| .text |
| |
| _GLOBAL(get_msr) |
| mfmsr r3 |
| blr |
| |
| _GLOBAL(get_srr0) |
| mfsrr0 r3 |
| blr |
| |
| _GLOBAL(get_srr1) |
| mfsrr1 r3 |
| blr |
| |
| #ifdef CONFIG_IRQSTACKS |
| _GLOBAL(call_do_softirq) |
| mflr r0 |
| std r0,16(r1) |
| stdu r1,THREAD_SIZE-112(r3) |
| mr r1,r3 |
| bl .__do_softirq |
| ld r1,0(r1) |
| ld r0,16(r1) |
| mtlr r0 |
| blr |
| |
| _GLOBAL(call_handle_irq) |
| ld r8,0(r6) |
| mflr r0 |
| std r0,16(r1) |
| mtctr r8 |
| stdu r1,THREAD_SIZE-112(r5) |
| mr r1,r5 |
| bctrl |
| ld r1,0(r1) |
| ld r0,16(r1) |
| mtlr r0 |
| blr |
| #endif /* CONFIG_IRQSTACKS */ |
| |
| .section ".toc","aw" |
| PPC64_CACHES: |
| .tc ppc64_caches[TC],ppc64_caches |
| .section ".text" |
| |
| /* |
| * Write any modified data cache blocks out to memory |
| * and invalidate the corresponding instruction cache blocks. |
| * |
| * flush_icache_range(unsigned long start, unsigned long stop) |
| * |
| * flush all bytes from start through stop-1 inclusive |
| */ |
| |
| _KPROBE(__flush_icache_range) |
| |
| /* |
| * Flush the data cache to memory |
| * |
| * Different systems have different cache line sizes |
| * and in some cases i-cache and d-cache line sizes differ from |
| * each other. |
| */ |
| ld r10,PPC64_CACHES@toc(r2) |
| lwz r7,DCACHEL1LINESIZE(r10)/* Get cache line size */ |
| addi r5,r7,-1 |
| andc r6,r3,r5 /* round low to line bdy */ |
| subf r8,r6,r4 /* compute length */ |
| add r8,r8,r5 /* ensure we get enough */ |
| lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of cache line size */ |
| srw. r8,r8,r9 /* compute line count */ |
| beqlr /* nothing to do? */ |
| mtctr r8 |
| 1: dcbst 0,r6 |
| add r6,r6,r7 |
| bdnz 1b |
| sync |
| |
| /* Now invalidate the instruction cache */ |
| |
| lwz r7,ICACHEL1LINESIZE(r10) /* Get Icache line size */ |
| addi r5,r7,-1 |
| andc r6,r3,r5 /* round low to line bdy */ |
| subf r8,r6,r4 /* compute length */ |
| add r8,r8,r5 |
| lwz r9,ICACHEL1LOGLINESIZE(r10) /* Get log-2 of Icache line size */ |
| srw. r8,r8,r9 /* compute line count */ |
| beqlr /* nothing to do? */ |
| mtctr r8 |
| 2: icbi 0,r6 |
| add r6,r6,r7 |
| bdnz 2b |
| isync |
| blr |
| .previous .text |
| /* |
| * Like above, but only do the D-cache. |
| * |
| * flush_dcache_range(unsigned long start, unsigned long stop) |
| * |
| * flush all bytes from start to stop-1 inclusive |
| */ |
| _GLOBAL(flush_dcache_range) |
| |
| /* |
| * Flush the data cache to memory |
| * |
| * Different systems have different cache line sizes |
| */ |
| ld r10,PPC64_CACHES@toc(r2) |
| lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */ |
| addi r5,r7,-1 |
| andc r6,r3,r5 /* round low to line bdy */ |
| subf r8,r6,r4 /* compute length */ |
| add r8,r8,r5 /* ensure we get enough */ |
| lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of dcache line size */ |
| srw. r8,r8,r9 /* compute line count */ |
| beqlr /* nothing to do? */ |
| mtctr r8 |
| 0: dcbst 0,r6 |
| add r6,r6,r7 |
| bdnz 0b |
| sync |
| blr |
| |
| /* |
| * Like above, but works on non-mapped physical addresses. |
| * Use only for non-LPAR setups ! It also assumes real mode |
| * is cacheable. Used for flushing out the DART before using |
| * it as uncacheable memory |
| * |
| * flush_dcache_phys_range(unsigned long start, unsigned long stop) |
| * |
| * flush all bytes from start to stop-1 inclusive |
| */ |
| _GLOBAL(flush_dcache_phys_range) |
| ld r10,PPC64_CACHES@toc(r2) |
| lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */ |
| addi r5,r7,-1 |
| andc r6,r3,r5 /* round low to line bdy */ |
| subf r8,r6,r4 /* compute length */ |
| add r8,r8,r5 /* ensure we get enough */ |
| lwz r9,DCACHEL1LOGLINESIZE(r10) /* Get log-2 of dcache line size */ |
| srw. r8,r8,r9 /* compute line count */ |
| beqlr /* nothing to do? */ |
| mfmsr r5 /* Disable MMU Data Relocation */ |
| ori r0,r5,MSR_DR |
| xori r0,r0,MSR_DR |
| sync |
| mtmsr r0 |
| sync |
| isync |
| mtctr r8 |
| 0: dcbst 0,r6 |
| add r6,r6,r7 |
| bdnz 0b |
| sync |
| isync |
| mtmsr r5 /* Re-enable MMU Data Relocation */ |
| sync |
| isync |
| blr |
| |
| _GLOBAL(flush_inval_dcache_range) |
| ld r10,PPC64_CACHES@toc(r2) |
| lwz r7,DCACHEL1LINESIZE(r10) /* Get dcache line size */ |
| addi r5,r7,-1 |
| andc r6,r3,r5 /* round low to line bdy */ |
| subf r8,r6,r4 /* compute length */ |
| add r8,r8,r5 /* ensure we get enough */ |
| lwz r9,DCACHEL1LOGLINESIZE(r10)/* Get log-2 of dcache line size */ |
| srw. r8,r8,r9 /* compute line count */ |
| beqlr /* nothing to do? */ |
| sync |
| isync |
| mtctr r8 |
| 0: dcbf 0,r6 |
| add r6,r6,r7 |
| bdnz 0b |
| sync |
| isync |
| 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. |
| * |
| * void __flush_dcache_icache(void *page) |
| */ |
| _GLOBAL(__flush_dcache_icache) |
| /* |
| * Flush the data cache to memory |
| * |
| * Different systems have different cache line sizes |
| */ |
| |
| /* Flush the dcache */ |
| ld r7,PPC64_CACHES@toc(r2) |
| clrrdi r3,r3,PAGE_SHIFT /* Page align */ |
| lwz r4,DCACHEL1LINESPERPAGE(r7) /* Get # dcache lines per page */ |
| lwz r5,DCACHEL1LINESIZE(r7) /* Get dcache line size */ |
| mr r6,r3 |
| mtctr r4 |
| 0: dcbst 0,r6 |
| add r6,r6,r5 |
| bdnz 0b |
| sync |
| |
| /* Now invalidate the icache */ |
| |
| lwz r4,ICACHEL1LINESPERPAGE(r7) /* Get # icache lines per page */ |
| lwz r5,ICACHEL1LINESIZE(r7) /* Get icache line size */ |
| mtctr r4 |
| 1: icbi 0,r3 |
| add r3,r3,r5 |
| bdnz 1b |
| isync |
| blr |
| |
| |
| #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) |
| /* |
| * Do an IO access in real mode |
| */ |
| _GLOBAL(real_readb) |
| mfmsr r7 |
| ori r0,r7,MSR_DR |
| xori r0,r0,MSR_DR |
| sync |
| mtmsrd r0 |
| sync |
| isync |
| mfspr r6,SPRN_HID4 |
| rldicl r5,r6,32,0 |
| ori r5,r5,0x100 |
| rldicl r5,r5,32,0 |
| sync |
| mtspr SPRN_HID4,r5 |
| isync |
| slbia |
| isync |
| lbz r3,0(r3) |
| sync |
| mtspr SPRN_HID4,r6 |
| isync |
| slbia |
| isync |
| mtmsrd 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 |
| mtmsrd r0 |
| sync |
| isync |
| mfspr r6,SPRN_HID4 |
| rldicl r5,r6,32,0 |
| ori r5,r5,0x100 |
| rldicl r5,r5,32,0 |
| sync |
| mtspr SPRN_HID4,r5 |
| isync |
| slbia |
| isync |
| stb r3,0(r4) |
| sync |
| mtspr SPRN_HID4,r6 |
| isync |
| slbia |
| isync |
| mtmsrd r7 |
| sync |
| isync |
| blr |
| #endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_MAPLE) */ |
| |
| #ifdef CONFIG_CPU_FREQ_PMAC64 |
| /* |
| * SCOM access functions for 970 (FX only for now) |
| * |
| * unsigned long scom970_read(unsigned int address); |
| * void scom970_write(unsigned int address, unsigned long value); |
| * |
| * The address passed in is the 24 bits register address. This code |
| * is 970 specific and will not check the status bits, so you should |
| * know what you are doing. |
| */ |
| _GLOBAL(scom970_read) |
| /* interrupts off */ |
| mfmsr r4 |
| ori r0,r4,MSR_EE |
| xori r0,r0,MSR_EE |
| mtmsrd r0,1 |
| |
| /* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits |
| * (including parity). On current CPUs they must be 0'd, |
| * and finally or in RW bit |
| */ |
| rlwinm r3,r3,8,0,15 |
| ori r3,r3,0x8000 |
| |
| /* do the actual scom read */ |
| sync |
| mtspr SPRN_SCOMC,r3 |
| isync |
| mfspr r3,SPRN_SCOMD |
| isync |
| mfspr r0,SPRN_SCOMC |
| isync |
| |
| /* XXX: fixup result on some buggy 970's (ouch ! we lost a bit, bah |
| * that's the best we can do). Not implemented yet as we don't use |
| * the scom on any of the bogus CPUs yet, but may have to be done |
| * ultimately |
| */ |
| |
| /* restore interrupts */ |
| mtmsrd r4,1 |
| blr |
| |
| |
| _GLOBAL(scom970_write) |
| /* interrupts off */ |
| mfmsr r5 |
| ori r0,r5,MSR_EE |
| xori r0,r0,MSR_EE |
| mtmsrd r0,1 |
| |
| /* rotate 24 bits SCOM address 8 bits left and mask out it's low 8 bits |
| * (including parity). On current CPUs they must be 0'd. |
| */ |
| |
| rlwinm r3,r3,8,0,15 |
| |
| sync |
| mtspr SPRN_SCOMD,r4 /* write data */ |
| isync |
| mtspr SPRN_SCOMC,r3 /* write command */ |
| isync |
| mfspr 3,SPRN_SCOMC |
| isync |
| |
| /* restore interrupts */ |
| mtmsrd r5,1 |
| blr |
| #endif /* CONFIG_CPU_FREQ_PMAC64 */ |
| |
| |
| /* |
| * Create a kernel thread |
| * kernel_thread(fn, arg, flags) |
| */ |
| _GLOBAL(kernel_thread) |
| std r29,-24(r1) |
| std r30,-16(r1) |
| stdu r1,-STACK_FRAME_OVERHEAD(r1) |
| mr r29,r3 |
| mr r30,r4 |
| ori r3,r5,CLONE_VM /* flags */ |
| oris r3,r3,(CLONE_UNTRACED>>16) |
| li r4,0 /* new sp (unused) */ |
| li r0,__NR_clone |
| sc |
| cmpdi 0,r3,0 /* parent or child? */ |
| bne 1f /* return if parent */ |
| li r0,0 |
| stdu r0,-STACK_FRAME_OVERHEAD(r1) |
| ld r2,8(r29) |
| ld r29,0(r29) |
| mtlr r29 /* fn addr in lr */ |
| mr r3,r30 /* load arg and call fn */ |
| blrl |
| li r0,__NR_exit /* exit after child exits */ |
| li r3,0 |
| sc |
| 1: addi r1,r1,STACK_FRAME_OVERHEAD |
| ld r29,-24(r1) |
| ld r30,-16(r1) |
| blr |
| |
| /* |
| * disable_kernel_fp() |
| * Disable the FPU. |
| */ |
| _GLOBAL(disable_kernel_fp) |
| mfmsr r3 |
| rldicl r0,r3,(63-MSR_FP_LG),1 |
| rldicl r3,r0,(MSR_FP_LG+1),0 |
| mtmsrd r3 /* disable use of fpu now */ |
| isync |
| blr |
| |
| #ifdef CONFIG_ALTIVEC |
| |
| #if 0 /* this has no callers for now */ |
| /* |
| * disable_kernel_altivec() |
| * Disable the VMX. |
| */ |
| _GLOBAL(disable_kernel_altivec) |
| mfmsr r3 |
| rldicl r0,r3,(63-MSR_VEC_LG),1 |
| rldicl r3,r0,(MSR_VEC_LG+1),0 |
| mtmsrd r3 /* disable use of VMX now */ |
| isync |
| blr |
| #endif /* 0 */ |
| |
| /* |
| * giveup_altivec(tsk) |
| * Disable VMX for the task given as the argument, |
| * and save the vector registers in its thread_struct. |
| * Enables the VMX for use in the kernel on return. |
| */ |
| _GLOBAL(giveup_altivec) |
| mfmsr r5 |
| oris r5,r5,MSR_VEC@h |
| mtmsrd r5 /* enable use of VMX now */ |
| isync |
| cmpdi 0,r3,0 |
| beqlr- /* if no previous owner, done */ |
| addi r3,r3,THREAD /* want THREAD of task */ |
| ld r5,PT_REGS(r3) |
| cmpdi 0,r5,0 |
| SAVE_32VRS(0,r4,r3) |
| mfvscr vr0 |
| li r4,THREAD_VSCR |
| stvx vr0,r4,r3 |
| beq 1f |
| ld r4,_MSR-STACK_FRAME_OVERHEAD(r5) |
| lis r3,MSR_VEC@h |
| andc r4,r4,r3 /* disable FP for previous task */ |
| std r4,_MSR-STACK_FRAME_OVERHEAD(r5) |
| 1: |
| #ifndef CONFIG_SMP |
| li r5,0 |
| ld r4,last_task_used_altivec@got(r2) |
| std r5,0(r4) |
| #endif /* CONFIG_SMP */ |
| blr |
| |
| #endif /* CONFIG_ALTIVEC */ |
| |
| _GLOBAL(kernel_execve) |
| li r0,__NR_execve |
| sc |
| bnslr |
| neg r3,r3 |
| blr |
| |
| /* kexec_wait(phys_cpu) |
| * |
| * wait for the flag to change, indicating this kernel is going away but |
| * the slave code for the next one is at addresses 0 to 100. |
| * |
| * This is used by all slaves. |
| * |
| * Physical (hardware) cpu id should be in r3. |
| */ |
| _GLOBAL(kexec_wait) |
| bl 1f |
| 1: mflr r5 |
| addi r5,r5,kexec_flag-1b |
| |
| 99: HMT_LOW |
| #ifdef CONFIG_KEXEC /* use no memory without kexec */ |
| lwz r4,0(r5) |
| cmpwi 0,r4,0 |
| bnea 0x60 |
| #endif |
| b 99b |
| |
| /* this can be in text because we won't change it until we are |
| * running in real anyways |
| */ |
| kexec_flag: |
| .long 0 |
| |
| |
| #ifdef CONFIG_KEXEC |
| |
| /* kexec_smp_wait(void) |
| * |
| * call with interrupts off |
| * note: this is a terminal routine, it does not save lr |
| * |
| * get phys id from paca |
| * set paca id to -1 to say we got here |
| * switch to real mode |
| * join other cpus in kexec_wait(phys_id) |
| */ |
| _GLOBAL(kexec_smp_wait) |
| lhz r3,PACAHWCPUID(r13) |
| li r4,-1 |
| sth r4,PACAHWCPUID(r13) /* let others know we left */ |
| bl real_mode |
| b .kexec_wait |
| |
| /* |
| * switch to real mode (turn mmu off) |
| * we use the early kernel trick that the hardware ignores bits |
| * 0 and 1 (big endian) of the effective address in real mode |
| * |
| * don't overwrite r3 here, it is live for kexec_wait above. |
| */ |
| real_mode: /* assume normal blr return */ |
| 1: li r9,MSR_RI |
| li r10,MSR_DR|MSR_IR |
| mflr r11 /* return address to SRR0 */ |
| mfmsr r12 |
| andc r9,r12,r9 |
| andc r10,r12,r10 |
| |
| mtmsrd r9,1 |
| mtspr SPRN_SRR1,r10 |
| mtspr SPRN_SRR0,r11 |
| rfid |
| |
| |
| /* |
| * kexec_sequence(newstack, start, image, control, clear_all()) |
| * |
| * does the grungy work with stack switching and real mode switches |
| * also does simple calls to other code |
| */ |
| |
| _GLOBAL(kexec_sequence) |
| mflr r0 |
| std r0,16(r1) |
| |
| /* switch stacks to newstack -- &kexec_stack.stack */ |
| stdu r1,THREAD_SIZE-112(r3) |
| mr r1,r3 |
| |
| li r0,0 |
| std r0,16(r1) |
| |
| /* save regs for local vars on new stack. |
| * yes, we won't go back, but ... |
| */ |
| std r31,-8(r1) |
| std r30,-16(r1) |
| std r29,-24(r1) |
| std r28,-32(r1) |
| std r27,-40(r1) |
| std r26,-48(r1) |
| std r25,-56(r1) |
| |
| stdu r1,-112-64(r1) |
| |
| /* save args into preserved regs */ |
| mr r31,r3 /* newstack (both) */ |
| mr r30,r4 /* start (real) */ |
| mr r29,r5 /* image (virt) */ |
| mr r28,r6 /* control, unused */ |
| mr r27,r7 /* clear_all() fn desc */ |
| mr r26,r8 /* spare */ |
| lhz r25,PACAHWCPUID(r13) /* get our phys cpu from paca */ |
| |
| /* disable interrupts, we are overwriting kernel data next */ |
| mfmsr r3 |
| rlwinm r3,r3,0,17,15 |
| mtmsrd r3,1 |
| |
| /* copy dest pages, flush whole dest image */ |
| mr r3,r29 |
| bl .kexec_copy_flush /* (image) */ |
| |
| /* turn off mmu */ |
| bl real_mode |
| |
| /* clear out hardware hash page table and tlb */ |
| ld r5,0(r27) /* deref function descriptor */ |
| mtctr r5 |
| bctrl /* ppc_md.hpte_clear_all(void); */ |
| |
| /* |
| * kexec image calling is: |
| * the first 0x100 bytes of the entry point are copied to 0 |
| * |
| * all slaves branch to slave = 0x60 (absolute) |
| * slave(phys_cpu_id); |
| * |
| * master goes to start = entry point |
| * start(phys_cpu_id, start, 0); |
| * |
| * |
| * a wrapper is needed to call existing kernels, here is an approximate |
| * description of one method: |
| * |
| * v2: (2.6.10) |
| * start will be near the boot_block (maybe 0x100 bytes before it?) |
| * it will have a 0x60, which will b to boot_block, where it will wait |
| * and 0 will store phys into struct boot-block and load r3 from there, |
| * copy kernel 0-0x100 and tell slaves to back down to 0x60 again |
| * |
| * v1: (2.6.9) |
| * boot block will have all cpus scanning device tree to see if they |
| * are the boot cpu ????? |
| * other device tree differences (prop sizes, va vs pa, etc)... |
| */ |
| |
| /* copy 0x100 bytes starting at start to 0 */ |
| li r3,0 |
| mr r4,r30 |
| li r5,0x100 |
| li r6,0 |
| bl .copy_and_flush /* (dest, src, copy limit, start offset) */ |
| 1: /* assume normal blr return */ |
| |
| /* release other cpus to the new kernel secondary start at 0x60 */ |
| mflr r5 |
| li r6,1 |
| stw r6,kexec_flag-1b(5) |
| mr r3,r25 # my phys cpu |
| mr r4,r30 # start, aka phys mem offset |
| mtlr 4 |
| li r5,0 |
| blr /* image->start(physid, image->start, 0); */ |
| #endif /* CONFIG_KEXEC */ |
