powerpc/kernel/misc_32.S

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)
22 #include <asm/asm-offsets.h>
26 #include <asm/feature-fixups.h>
31  * This returns the high 64 bits of the product of two 64-bit numbers.
46 	beq	2f
52 2:	addc	r4,r4,r9
67 	srwi.	r8,r8,2
76 2:	lwz	r0,0(r7)
80 	bdnz	2b
85  * call_setup_cpu - call the setup_cpu function for this cpu
106 /* This gets called by via-pmu.c to switch the PLL selection
108  * other place (as most of the cpufreq code in via-pmu
121 	sync
124 	sync
137 	slwi	r6,r6,2
149 	sync
152 	sync
168 	sync
170 	sync
187 	sync
189 	sync
192 	sync
194 	sync
205 	sync
207 	sync
210 	sync
212 	sync
236 	rlwinm	r5, r3, 0, L1_CACHE_BYTES - 1
237 	addi	r3,r3,-4
242 	addi	r4,r4,-4
257 	li	r0,PAGE_SIZE/L1_CACHE_BYTES - MAX_COPY_PREFETCH
259 2:
283 	b	2b
290  * -- Gabriel
303 	addi	r7,r5,32	# could be xori, or addi with -32
304 	slw	r6,r3,r6	# t1 = count > 31 ? 0 : MSW << (32-count)
306 	sraw	r7,r3,r7	# t2 = MSW >> (count-32)
317 	addi	r7,r5,32	# could be xori, or addi with -32
318 	srw	r6,r4,r6	# t1 = count > 31 ? 0 : LSW >> (32-count)
319 	slw	r7,r4,r7	# t2 = count < 32 ? 0 : LSW << (count-32)
329 	addi	r7,r5,32	# could be xori, or addi with -32
330 	slw	r6,r3,r6	# t1 = count > 31 ? 0 : MSW << (32-count)
331 	srw	r7,r3,r7	# t2 = count < 32 ? 0 : MSW >> (count-32)
339  * 64-bit comparison: __cmpdi2(s64 a, s64 b)
340  * Returns 0 if a < b, 1 if a == b, 2 if a > b.
350 	li	r3,2
354  * 64-bit comparison: __ucmpdi2(u64 a, u64 b)
355  * Returns 0 if a < b, 1 if a == b, 2 if a > b.
365 	li	r3,2
384 	rlwinm	r1, r1, 0, 0, 31 - THREAD_SHIFT
385 	addi	r1,r1,THREAD_SIZE-STACK_FRAME_MIN_SIZE