| /* 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. |
| * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) |
| * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) |
| */ |
| |
| #include <linux/linkage.h> |
| #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> |
| #include <asm/kexec.h> |
| #include <asm/ptrace.h> |
| #include <asm/mmu.h> |
| #include <asm/export.h> |
| #include <asm/feature-fixups.h> |
| |
| .text |
| |
| _GLOBAL(__bswapdi2) |
| EXPORT_SYMBOL(__bswapdi2) |
| srdi r8,r3,32 |
| rlwinm r7,r3,8,0xffffffff |
| rlwimi r7,r3,24,0,7 |
| rlwinm r9,r8,8,0xffffffff |
| rlwimi r7,r3,24,16,23 |
| rlwimi r9,r8,24,0,7 |
| rlwimi r9,r8,24,16,23 |
| sldi r7,r7,32 |
| or r3,r7,r9 |
| blr |
| |
| |
| #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX |
| _GLOBAL(rmci_on) |
| sync |
| isync |
| li r3,0x100 |
| rldicl r3,r3,32,0 |
| mfspr r5,SPRN_HID4 |
| or r5,r5,r3 |
| sync |
| mtspr SPRN_HID4,r5 |
| isync |
| slbia |
| isync |
| sync |
| blr |
| |
| _GLOBAL(rmci_off) |
| sync |
| isync |
| li r3,0x100 |
| rldicl r3,r3,32,0 |
| mfspr r5,SPRN_HID4 |
| andc r5,r5,r3 |
| sync |
| mtspr SPRN_HID4,r5 |
| isync |
| slbia |
| isync |
| sync |
| blr |
| #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */ |
| |
| #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_PPC_PASEMI |
| |
| _GLOBAL(real_205_readb) |
| mfmsr r7 |
| ori r0,r7,MSR_DR |
| xori r0,r0,MSR_DR |
| sync |
| mtmsrd r0 |
| sync |
| isync |
| LBZCIX(R3,R0,R3) |
| isync |
| mtmsrd r7 |
| sync |
| isync |
| blr |
| |
| _GLOBAL(real_205_writeb) |
| mfmsr r7 |
| ori r0,r7,MSR_DR |
| xori r0,r0,MSR_DR |
| sync |
| mtmsrd r0 |
| sync |
| isync |
| STBCIX(R3,R0,R4) |
| isync |
| mtmsrd r7 |
| sync |
| isync |
| blr |
| |
| #endif /* CONFIG_PPC_PASEMI */ |
| |
| |
| #if defined(CONFIG_CPU_FREQ_PMAC64) || defined(CONFIG_CPU_FREQ_MAPLE) |
| /* |
| * 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 || CONFIG_CPU_FREQ_MAPLE */ |
| |
| /* 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, even those that did not find a matching |
| * paca in the secondary startup code. |
| * |
| * Physical (hardware) cpu id should be in r3. |
| */ |
| _GLOBAL(kexec_wait) |
| bcl 20,31,$+4 |
| 1: mflr r5 |
| addi r5,r5,kexec_flag-1b |
| |
| 99: HMT_LOW |
| #ifdef CONFIG_KEXEC_CORE /* use no memory without kexec */ |
| lwz r4,0(r5) |
| cmpwi 0,r4,0 |
| beq 99b |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| li r10,0x60 |
| mfmsr r11 |
| clrrdi r11,r11,1 /* Clear MSR_LE */ |
| mtsrr0 r10 |
| mtsrr1 r11 |
| rfid |
| #else |
| /* Create TLB entry in book3e_secondary_core_init */ |
| li r4,0 |
| ba 0x60 |
| #endif |
| #endif |
| |
| /* 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_CORE |
| #ifdef CONFIG_PPC_BOOK3E_64 |
| /* |
| * BOOK3E has no real MMU mode, so we have to setup the initial TLB |
| * for a core to identity map v:0 to p:0. This current implementation |
| * assumes that 1G is enough for kexec. |
| */ |
| kexec_create_tlb: |
| /* |
| * Invalidate all non-IPROT TLB entries to avoid any TLB conflict. |
| * IPROT TLB entries should be >= PAGE_OFFSET and thus not conflict. |
| */ |
| PPC_TLBILX_ALL(0,R0) |
| sync |
| isync |
| |
| mfspr r10,SPRN_TLB1CFG |
| andi. r10,r10,TLBnCFG_N_ENTRY /* Extract # entries */ |
| subi r10,r10,1 /* Last entry: no conflict with kernel text */ |
| lis r9,MAS0_TLBSEL(1)@h |
| rlwimi r9,r10,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r9) */ |
| |
| /* Set up a temp identity mapping v:0 to p:0 and return to it. */ |
| mtspr SPRN_MAS0,r9 |
| |
| lis r9,(MAS1_VALID|MAS1_IPROT)@h |
| ori r9,r9,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l |
| mtspr SPRN_MAS1,r9 |
| |
| LOAD_REG_IMMEDIATE(r9, 0x0 | MAS2_M_IF_NEEDED) |
| mtspr SPRN_MAS2,r9 |
| |
| LOAD_REG_IMMEDIATE(r9, 0x0 | MAS3_SR | MAS3_SW | MAS3_SX) |
| mtspr SPRN_MAS3,r9 |
| li r9,0 |
| mtspr SPRN_MAS7,r9 |
| |
| tlbwe |
| isync |
| blr |
| #endif |
| |
| /* kexec_smp_wait(void) |
| * |
| * call with interrupts off |
| * note: this is a terminal routine, it does not save lr |
| * |
| * get phys id from paca |
| * switch to real mode |
| * mark the paca as no longer used |
| * join other cpus in kexec_wait(phys_id) |
| */ |
| _GLOBAL(kexec_smp_wait) |
| lhz r3,PACAHWCPUID(r13) |
| bl real_mode |
| |
| li r4,KEXEC_STATE_REAL_MODE |
| stb r4,PACAKEXECSTATE(r13) |
| |
| 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. |
| */ |
| SYM_FUNC_START_LOCAL(real_mode) /* assume normal blr return */ |
| #ifdef CONFIG_PPC_BOOK3E_64 |
| /* Create an identity mapping. */ |
| b kexec_create_tlb |
| #else |
| 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 |
| #endif |
| SYM_FUNC_END(real_mode) |
| |
| /* |
| * kexec_sequence(newstack, start, image, control, clear_all(), |
| copy_with_mmu_off) |
| * |
| * 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-STACK_FRAME_MIN_SIZE(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,-STACK_FRAME_MIN_SIZE-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 /* copy_with_mmu_off */ |
| lhz r25,PACAHWCPUID(r13) /* get our phys cpu from paca */ |
| |
| /* disable interrupts, we are overwriting kernel data next */ |
| #ifdef CONFIG_PPC_BOOK3E_64 |
| wrteei 0 |
| #else |
| mfmsr r3 |
| rlwinm r3,r3,0,17,15 |
| mtmsrd r3,1 |
| #endif |
| |
| /* We need to turn the MMU off unless we are in hash mode |
| * under a hypervisor |
| */ |
| cmpdi r26,0 |
| beq 1f |
| bl real_mode |
| 1: |
| /* copy dest pages, flush whole dest image */ |
| mr r3,r29 |
| bl CFUNC(kexec_copy_flush) /* (image) */ |
| |
| /* turn off mmu now if not done earlier */ |
| cmpdi r26,0 |
| bne 1f |
| bl real_mode |
| |
| /* copy 0x100 bytes starting at start to 0 */ |
| 1: li r3,0 |
| mr r4,r30 /* start, aka phys mem offset */ |
| 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) |
| |
| cmpdi r27,0 |
| beq 1f |
| |
| /* clear out hardware hash page table and tlb */ |
| #ifdef CONFIG_PPC64_ELF_ABI_V1 |
| ld r12,0(r27) /* deref function descriptor */ |
| #else |
| mr r12,r27 |
| #endif |
| mtctr r12 |
| bctrl /* mmu_hash_ops.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)... |
| */ |
| 1: 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_CORE */ |
