/* 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)
*/
#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 its 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 its low 8 bits * (including parity). On current CPUs they must be 0'd.
*/
/* 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
/* 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
*/
/* 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)
/* 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 */
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