1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * This file contains miscellaneous low-level functions.
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
10 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
11 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
12 * PPC44x port. Copyright (C) 2011, IBM Corporation
13 * Author: Suzuki Poulose <suzuki@in.ibm.com>
16 #include <linux/sys.h>
17 #include <asm/unistd.h>
18 #include <asm/errno.h>
21 #include <asm/cache.h>
22 #include <asm/cputable.h>
24 #include <asm/ppc_asm.h>
25 #include <asm/thread_info.h>
26 #include <asm/asm-offsets.h>
27 #include <asm/processor.h>
28 #include <asm/kexec.h>
30 #include <asm/ptrace.h>
31 #include <asm/export.h>
32 #include <asm/feature-fixups.h>
37 * We store the saved ksp_limit in the unused part
38 * of the STACK_FRAME_OVERHEAD
40 _GLOBAL(call_do_softirq)
43 lwz r10,THREAD+KSP_LIMIT(r2)
44 stw r3, THREAD+KSP_LIMIT(r2)
45 stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
52 stw r10,THREAD+KSP_LIMIT(r2)
57 * void call_do_irq(struct pt_regs *regs, void *sp);
62 lwz r10,THREAD+KSP_LIMIT(r2)
63 stw r4, THREAD+KSP_LIMIT(r2)
64 stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4)
71 stw r10,THREAD+KSP_LIMIT(r2)
76 * This returns the high 64 bits of the product of two 64-bit numbers.
88 1: beqlr cr1 /* all done if high part of A is 0 */
102 * reloc_got2 runs through the .got2 section adding an offset
107 lis r7,__got2_start@ha
108 addi r7,r7,__got2_start@l
110 addi r8,r8,__got2_end@l
130 * call_setup_cpu - call the setup_cpu function for this cpu
131 * r3 = data offset, r24 = cpu number
133 * Setup function is called with:
135 * r4 = ptr to CPU spec (relocated)
137 _GLOBAL(call_setup_cpu)
138 addis r4,r3,cur_cpu_spec@ha
139 addi r4,r4,cur_cpu_spec@l
142 lwz r5,CPU_SPEC_SETUP(r4)
149 #if defined(CONFIG_CPU_FREQ_PMAC) && defined(CONFIG_PPC_BOOK3S_32)
151 /* This gets called by via-pmu.c to switch the PLL selection
152 * on 750fx CPU. This function should really be moved to some
153 * other place (as most of the cpufreq code in via-pmu
155 _GLOBAL(low_choose_750fx_pll)
161 /* If switching to PLL1, disable HID0:BTIC */
172 /* Calc new HID1 value */
173 mfspr r4,SPRN_HID1 /* Build a HID1:PS bit from parameter */
174 rlwinm r5,r3,16,15,15 /* Clear out HID1:PS from value read */
175 rlwinm r4,r4,0,16,14 /* Could have I used rlwimi here ? */
180 /* Store new HID1 image */
186 addis r6,r6,nap_save_hid1@ha
187 stw r4,nap_save_hid1@l(r6)
189 /* If switching to PLL0, enable HID0:BTIC */
204 _GLOBAL(low_choose_7447a_dfs)
210 /* Calc new HID1 value */
212 insrwi r4,r3,1,9 /* insert parameter into bit 9 */
222 #endif /* CONFIG_CPU_FREQ_PMAC && CONFIG_PPC_BOOK3S_32 */
225 * complement mask on the msr then "or" some values on.
226 * _nmask_and_or_msr(nmask, value_to_or)
228 _GLOBAL(_nmask_and_or_msr)
229 mfmsr r0 /* Get current msr */
230 andc r0,r0,r3 /* And off the bits set in r3 (first parm) */
231 or r0,r0,r4 /* Or on the bits in r4 (second parm) */
232 SYNC /* Some chip revs have problems here... */
233 mtmsr r0 /* Update machine state */
240 * Do an IO access in real mode
244 rlwinm r0,r7,0,~MSR_DR
257 * Do an IO access in real mode
261 rlwinm r0,r7,0,~MSR_DR
273 #endif /* CONFIG_40x */
277 * Flush instruction cache.
278 * This is a no-op on the 601.
280 #ifndef CONFIG_PPC_8xx
281 _GLOBAL(flush_instruction_cache)
282 #if defined(CONFIG_4xx)
294 #elif defined(CONFIG_FSL_BOOKE)
297 ori r3,r3,L1CSR0_CFI|L1CSR0_CLFC
298 /* msync; isync recommended here */
302 END_FTR_SECTION_IFSET(CPU_FTR_UNIFIED_ID_CACHE)
304 ori r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR
308 rlwinm r3,r3,16,16,31
310 beqlr /* for 601, do nothing */
311 /* 603/604 processor - use invalidate-all bit in HID0 */
315 #endif /* CONFIG_4xx */
318 EXPORT_SYMBOL(flush_instruction_cache)
319 #endif /* CONFIG_PPC_8xx */
322 * Write any modified data cache blocks out to memory
323 * and invalidate the corresponding instruction cache blocks.
324 * This is a no-op on the 601.
326 * flush_icache_range(unsigned long start, unsigned long stop)
328 _GLOBAL(flush_icache_range)
331 blr /* for 601, do nothing */
332 END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
333 rlwinm r3,r3,0,0,31 - L1_CACHE_SHIFT
335 addi r4,r4,L1_CACHE_BYTES - 1
336 srwi. r4,r4,L1_CACHE_SHIFT
341 addi r3,r3,L1_CACHE_BYTES
343 sync /* wait for dcbst's to get to ram */
347 addi r6,r6,L1_CACHE_BYTES
350 /* Flash invalidate on 44x because we are passed kmapped addresses and
351 this doesn't work for userspace pages due to the virtually tagged
355 sync /* additional sync needed on g4 */
358 _ASM_NOKPROBE_SYMBOL(flush_icache_range)
359 EXPORT_SYMBOL(flush_icache_range)
362 * Flush a particular page from the data cache to RAM.
363 * Note: this is necessary because the instruction cache does *not*
364 * snoop from the data cache.
365 * This is a no-op on the 601 which has a unified cache.
367 * void __flush_dcache_icache(void *page)
369 _GLOBAL(__flush_dcache_icache)
373 END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
374 rlwinm r3,r3,0,0,31-PAGE_SHIFT /* Get page base address */
375 li r4,PAGE_SIZE/L1_CACHE_BYTES /* Number of lines in a page */
378 0: dcbst 0,r3 /* Write line to ram */
379 addi r3,r3,L1_CACHE_BYTES
383 /* We don't flush the icache on 44x. Those have a virtual icache
384 * and we don't have access to the virtual address here (it's
385 * not the page vaddr but where it's mapped in user space). The
386 * flushing of the icache on these is handled elsewhere, when
387 * a change in the address space occurs, before returning to
390 BEGIN_MMU_FTR_SECTION
392 END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_44x)
393 #endif /* CONFIG_44x */
396 addi r6,r6,L1_CACHE_BYTES
404 * Flush a particular page from the data cache to RAM, identified
405 * by its physical address. We turn off the MMU so we can just use
406 * the physical address (this may be a highmem page without a kernel
409 * void __flush_dcache_icache_phys(unsigned long physaddr)
411 _GLOBAL(__flush_dcache_icache_phys)
414 blr /* for 601, do nothing */
415 END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
417 rlwinm r0,r10,0,28,26 /* clear DR */
420 rlwinm r3,r3,0,0,31-PAGE_SHIFT /* Get page base address */
421 li r4,PAGE_SIZE/L1_CACHE_BYTES /* Number of lines in a page */
424 0: dcbst 0,r3 /* Write line to ram */
425 addi r3,r3,L1_CACHE_BYTES
430 addi r6,r6,L1_CACHE_BYTES
433 mtmsr r10 /* restore DR */
436 #endif /* CONFIG_BOOKE */
439 * Copy a whole page. We use the dcbz instruction on the destination
440 * to reduce memory traffic (it eliminates the unnecessary reads of
441 * the destination into cache). This requires that the destination
444 #define COPY_16_BYTES \
460 #if MAX_COPY_PREFETCH > 1
461 li r0,MAX_COPY_PREFETCH
465 addi r11,r11,L1_CACHE_BYTES
467 #else /* MAX_COPY_PREFETCH == 1 */
469 li r11,L1_CACHE_BYTES+4
470 #endif /* MAX_COPY_PREFETCH */
471 li r0,PAGE_SIZE/L1_CACHE_BYTES - MAX_COPY_PREFETCH
479 #if L1_CACHE_BYTES >= 32
481 #if L1_CACHE_BYTES >= 64
484 #if L1_CACHE_BYTES >= 128
494 crnot 4*cr0+eq,4*cr0+eq
495 li r0,MAX_COPY_PREFETCH
498 EXPORT_SYMBOL(copy_page)
501 * Extended precision shifts.
503 * Updated to be valid for shift counts from 0 to 63 inclusive.
506 * R3/R4 has 64 bit value
510 * ashrdi3: arithmetic right shift (sign propagation)
511 * lshrdi3: logical right shift
512 * ashldi3: left shift
516 srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count
517 addi r7,r5,32 # could be xori, or addi with -32
518 slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count)
519 rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0
520 sraw r7,r3,r7 # t2 = MSW >> (count-32)
521 or r4,r4,r6 # LSW |= t1
522 slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2
523 sraw r3,r3,r5 # MSW = MSW >> count
524 or r4,r4,r7 # LSW |= t2
526 EXPORT_SYMBOL(__ashrdi3)
530 slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count
531 addi r7,r5,32 # could be xori, or addi with -32
532 srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count)
533 slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32)
534 or r3,r3,r6 # MSW |= t1
535 slw r4,r4,r5 # LSW = LSW << count
536 or r3,r3,r7 # MSW |= t2
538 EXPORT_SYMBOL(__ashldi3)
542 srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count
543 addi r7,r5,32 # could be xori, or addi with -32
544 slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count)
545 srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32)
546 or r4,r4,r6 # LSW |= t1
547 srw r3,r3,r5 # MSW = MSW >> count
548 or r4,r4,r7 # LSW |= t2
550 EXPORT_SYMBOL(__lshrdi3)
553 * 64-bit comparison: __cmpdi2(s64 a, s64 b)
554 * Returns 0 if a < b, 1 if a == b, 2 if a > b.
566 EXPORT_SYMBOL(__cmpdi2)
568 * 64-bit comparison: __ucmpdi2(u64 a, u64 b)
569 * Returns 0 if a < b, 1 if a == b, 2 if a > b.
581 EXPORT_SYMBOL(__ucmpdi2)
588 rlwimi r9,r4,24,16,23
589 rlwimi r10,r3,24,16,23
593 EXPORT_SYMBOL(__bswapdi2)
596 _GLOBAL(start_secondary_resume)
598 rlwinm r1, r1, 0, 0, 31 - THREAD_SHIFT
599 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
601 stw r3,0(r1) /* Zero the stack frame pointer */
604 #endif /* CONFIG_SMP */
607 * This routine is just here to keep GCC happy - sigh...
612 #ifdef CONFIG_KEXEC_CORE
614 * Must be relocatable PIC code callable as a C function.
616 .globl relocate_new_kernel
619 /* r4 = reboot_code_buffer */
620 /* r5 = start_address */
622 #ifdef CONFIG_FSL_BOOKE
628 #define ENTRY_MAPPING_KEXEC_SETUP
629 #include "fsl_booke_entry_mapping.S"
630 #undef ENTRY_MAPPING_KEXEC_SETUP
637 #elif defined(CONFIG_44x)
639 /* Save our parameters */
644 #ifdef CONFIG_PPC_47x
645 /* Check for 47x cores */
648 cmplwi cr0,r3,PVR_476FPE@h
650 cmplwi cr0,r3,PVR_476@h
652 cmplwi cr0,r3,PVR_476_ISS@h
654 #endif /* CONFIG_PPC_47x */
657 * Code for setting up 1:1 mapping for PPC440x for KEXEC
659 * We cannot switch off the MMU on PPC44x.
661 * 1) Invalidate all the mappings except the one we are running from.
662 * 2) Create a tmp mapping for our code in the other address space(TS) and
663 * jump to it. Invalidate the entry we started in.
664 * 3) Create a 1:1 mapping for 0-2GiB in chunks of 256M in original TS.
665 * 4) Jump to the 1:1 mapping in original TS.
666 * 5) Invalidate the tmp mapping.
668 * - Based on the kexec support code for FSL BookE
673 * Load the PID with kernel PID (0).
674 * Also load our MSR_IS and TID to MMUCR for TLB search.
681 oris r3,r3,PPC44x_MMUCR_STS@h
687 * Invalidate all the TLB entries except the current entry
688 * where we are running from
690 bl 0f /* Find our address */
691 0: mflr r5 /* Make it accessible */
692 tlbsx r23,0,r5 /* Find entry we are in */
693 li r4,0 /* Start at TLB entry 0 */
694 li r3,0 /* Set PAGEID inval value */
695 1: cmpw r23,r4 /* Is this our entry? */
696 beq skip /* If so, skip the inval */
697 tlbwe r3,r4,PPC44x_TLB_PAGEID /* If not, inval the entry */
699 addi r4,r4,1 /* Increment */
700 cmpwi r4,64 /* Are we done? */
701 bne 1b /* If not, repeat */
704 /* Create a temp mapping and jump to it */
705 andi. r6, r23, 1 /* Find the index to use */
706 addi r24, r6, 1 /* r24 will contain 1 or 2 */
708 mfmsr r9 /* get the MSR */
709 rlwinm r5, r9, 27, 31, 31 /* Extract the MSR[IS] */
710 xori r7, r5, 1 /* Use the other address space */
712 /* Read the current mapping entries */
713 tlbre r3, r23, PPC44x_TLB_PAGEID
714 tlbre r4, r23, PPC44x_TLB_XLAT
715 tlbre r5, r23, PPC44x_TLB_ATTRIB
717 /* Save our current XLAT entry */
720 /* Extract the TLB PageSize */
721 li r10, 1 /* r10 will hold PageSize */
722 rlwinm r11, r3, 0, 24, 27 /* bits 24-27 */
724 /* XXX: As of now we use 256M, 4K pages */
725 cmpwi r11, PPC44x_TLB_256M
727 rotlwi r10, r10, 28 /* r10 = 256M */
730 cmpwi r11, PPC44x_TLB_4K
732 rotlwi r10, r10, 12 /* r10 = 4K */
735 rotlwi r10, r10, 10 /* r10 = 1K */
739 * Write out the tmp 1:1 mapping for this code in other address space
740 * Fixup EPN = RPN , TS=other address space
742 insrwi r3, r7, 1, 23 /* Bit 23 is TS for PAGEID field */
744 /* Write out the tmp mapping entries */
745 tlbwe r3, r24, PPC44x_TLB_PAGEID
746 tlbwe r4, r24, PPC44x_TLB_XLAT
747 tlbwe r5, r24, PPC44x_TLB_ATTRIB
749 subi r11, r10, 1 /* PageOffset Mask = PageSize - 1 */
750 not r10, r11 /* Mask for PageNum */
752 /* Switch to other address space in MSR */
753 insrwi r9, r7, 1, 26 /* Set MSR[IS] = r7 */
757 addi r8, r8, (2f-1b) /* Find the target offset */
759 /* Jump to the tmp mapping */
765 /* Invalidate the entry we were executing from */
767 tlbwe r3, r23, PPC44x_TLB_PAGEID
769 /* attribute fields. rwx for SUPERVISOR mode */
771 ori r5, r5, (PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_SX | PPC44x_TLB_G)
773 /* Create 1:1 mapping in 256M pages */
774 xori r7, r7, 1 /* Revert back to Original TS */
776 li r8, 0 /* PageNumber */
777 li r6, 3 /* TLB Index, start at 3 */
780 rotlwi r3, r8, 28 /* Create EPN (bits 0-3) */
781 mr r4, r3 /* RPN = EPN */
782 ori r3, r3, (PPC44x_TLB_VALID | PPC44x_TLB_256M) /* SIZE = 256M, Valid */
783 insrwi r3, r7, 1, 23 /* Set TS from r7 */
785 tlbwe r3, r6, PPC44x_TLB_PAGEID /* PageID field : EPN, V, SIZE */
786 tlbwe r4, r6, PPC44x_TLB_XLAT /* Address translation : RPN */
787 tlbwe r5, r6, PPC44x_TLB_ATTRIB /* Attributes */
789 addi r8, r8, 1 /* Increment PN */
790 addi r6, r6, 1 /* Increment TLB Index */
791 cmpwi r8, 8 /* Are we done ? */
795 /* Jump to the new mapping 1:1 */
797 insrwi r9, r7, 1, 26 /* Set MSR[IS] = r7 */
801 and r8, r8, r11 /* Get our offset within page */
804 and r5, r25, r10 /* Get our target PageNum */
805 or r8, r8, r5 /* Target jump address */
811 /* Invalidate the tmp entry we used */
813 tlbwe r3, r24, PPC44x_TLB_PAGEID
817 #ifdef CONFIG_PPC_47x
819 /* 1:1 mapping for 47x */
824 * Load the kernel pid (0) to PID and also to MMUCR[TID].
825 * Also set the MSR IS->MMUCR STS
828 mtspr SPRN_PID, r3 /* Set PID */
829 mfmsr r4 /* Get MSR */
830 andi. r4, r4, MSR_IS@l /* TS=1? */
831 beq 1f /* If not, leave STS=0 */
832 oris r3, r3, PPC47x_MMUCR_STS@h /* Set STS=1 */
833 1: mtspr SPRN_MMUCR, r3 /* Put MMUCR */
836 /* Find the entry we are running from */
840 tlbre r24, r23, 0 /* TLB Word 0 */
841 tlbre r25, r23, 1 /* TLB Word 1 */
842 tlbre r26, r23, 2 /* TLB Word 2 */
846 * Invalidates all the tlb entries by writing to 256 RPNs(r4)
847 * of 4k page size in all 4 ways (0-3 in r3).
848 * This would invalidate the entire UTLB including the one we are
849 * running from. However the shadow TLB entries would help us
850 * to continue the execution, until we flush them (rfi/isync).
852 addis r3, 0, 0x8000 /* specify the way */
853 addi r4, 0, 0 /* TLB Word0 = (EPN=0, VALID = 0) */
857 /* Align the loop to speed things up. from head_44x.S */
865 addis r3, r3, 0x2000 /* Increment the way */
869 addis r4, r4, 0x100 /* Increment the EPN */
873 /* Create the entries in the other address space */
875 rlwinm r7, r5, 27, 31, 31 /* Get the TS (Bit 26) from MSR */
876 xori r7, r7, 1 /* r7 = !TS */
878 insrwi r24, r7, 1, 21 /* Change the TS in the saved TLB word 0 */
881 * write out the TLB entries for the tmp mapping
882 * Use way '0' so that we could easily invalidate it later.
884 lis r3, 0x8000 /* Way '0' */
890 /* Update the msr to the new TS */
902 * Now we are in the tmp address space.
903 * Create a 1:1 mapping for 0-2GiB in the original TS.
907 li r4, 0 /* TLB Word 0 */
908 li r5, 0 /* TLB Word 1 */
910 ori r6, r6, PPC47x_TLB2_S_RWX /* TLB word 2 */
912 li r8, 0 /* PageIndex */
914 xori r7, r7, 1 /* revert back to original TS */
917 rotlwi r5, r8, 28 /* RPN = PageIndex * 256M */
918 /* ERPN = 0 as we don't use memory above 2G */
920 mr r4, r5 /* EPN = RPN */
921 ori r4, r4, (PPC47x_TLB0_VALID | PPC47x_TLB0_256M)
922 insrwi r4, r7, 1, 21 /* Insert the TS to Word 0 */
924 tlbwe r4, r3, 0 /* Write out the entries */
928 cmpwi r8, 8 /* Have we completed ? */
931 /* make sure we complete the TLB write up */
935 * Prepare to jump to the 1:1 mapping.
936 * 1) Extract page size of the tmp mapping
937 * DSIZ = TLB_Word0[22:27]
938 * 2) Calculate the physical address of the address
941 rlwinm r10, r24, 0, 22, 27
943 cmpwi r10, PPC47x_TLB0_4K
945 li r10, 0x1000 /* r10 = 4k */
949 /* Defaults to 256M */
954 addi r4, r4, (2f-1b) /* virtual address of 2f */
956 subi r11, r10, 1 /* offsetmask = Pagesize - 1 */
957 not r10, r11 /* Pagemask = ~(offsetmask) */
959 and r5, r25, r10 /* Physical page */
960 and r6, r4, r11 /* offset within the current page */
962 or r5, r5, r6 /* Physical address for 2f */
964 /* Switch the TS in MSR to the original one */
973 /* Invalidate the tmp mapping */
974 lis r3, 0x8000 /* Way '0' */
976 clrrwi r24, r24, 12 /* Clear the valid bit */
981 /* Make sure we complete the TLB write and flush the shadow TLB */
989 /* Restore the parameters */
999 * Set Machine Status Register to a known status,
1000 * switch the MMU off and jump to 1: in a single step.
1004 ori r8, r8, MSR_RI|MSR_ME
1006 addi r8, r4, 1f - relocate_new_kernel
1013 /* from this point address translation is turned off */
1014 /* and interrupts are disabled */
1016 /* set a new stack at the bottom of our page... */
1017 /* (not really needed now) */
1018 addi r1, r4, KEXEC_CONTROL_PAGE_SIZE - 8 /* for LR Save+Back Chain */
1022 li r6, 0 /* checksum */
1026 0: /* top, read another word for the indirection page */
1030 /* is it a destination page? (r8) */
1031 rlwinm. r7, r0, 0, 31, 31 /* IND_DESTINATION (1<<0) */
1034 rlwinm r8, r0, 0, 0, 19 /* clear kexec flags, page align */
1037 2: /* is it an indirection page? (r3) */
1038 rlwinm. r7, r0, 0, 30, 30 /* IND_INDIRECTION (1<<1) */
1041 rlwinm r3, r0, 0, 0, 19 /* clear kexec flags, page align */
1045 2: /* are we done? */
1046 rlwinm. r7, r0, 0, 29, 29 /* IND_DONE (1<<2) */
1050 2: /* is it a source page? (r9) */
1051 rlwinm. r7, r0, 0, 28, 28 /* IND_SOURCE (1<<3) */
1054 rlwinm r9, r0, 0, 0, 19 /* clear kexec flags, page align */
1056 li r7, PAGE_SIZE / 4
1061 lwzu r0, 4(r9) /* do the copy */
1075 /* To be certain of avoiding problems with self-modifying code
1076 * execute a serializing instruction here.
1081 mfspr r3, SPRN_PIR /* current core we are running on */
1082 mr r4, r5 /* load physical address of chunk called */
1084 /* jump to the entry point, usually the setup routine */
1090 relocate_new_kernel_end:
1092 .globl relocate_new_kernel_size
1093 relocate_new_kernel_size:
1094 .long relocate_new_kernel_end - relocate_new_kernel