1 files changed, 390 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
new file mode 100644
index 000000000..2eabb1568
--- /dev/null
+++ b/arch/powerpc/kernel/misc_32.S
@@ -0,0 +1,390 @@
+/* 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/export.h>
+#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/feature-fixups.h>
+
+	.text
+
+/*
+ * 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
+	bcl	20,31,$+4
+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_WARN_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_MIN_SIZE
+	li	r3,0
+	stw	r3,0(r1)		/* Zero the stack frame pointer	*/
+	bl	start_secondary
+	b	.
+#endif /* CONFIG_SMP */