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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/parisc/kernel/relocate_kernel.S
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/* SPDX-License-Identifier: GPL-2.0 */

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#include <linux/linkage.h>

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#include <linux/kexec.h>

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#include <asm/assembly.h>

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#include <asm/asm-offsets.h>

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#include <asm/page.h>

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#include <asm/setup.h>

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#include <asm/psw.h>

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.level PA_ASM_LEVEL

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.macro	kexec_param name

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.align 8

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ENTRY(kexec\()_\name)

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#ifdef CONFIG_64BIT

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	.dword 0

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#else

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	.word 0

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#endif

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ENTRY(kexec\()_\name\()_offset)

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	.word kexec\()_\name - relocate_new_kernel

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.endm

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.text

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/* args:

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 * r26 - kimage->head

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 * r25 - start address of kernel

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 * r24 - physical address of relocate code

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 */

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ENTRY_CFI(relocate_new_kernel)

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0:	copy	%arg1, %rp

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	/* disable I and Q bit, so we are allowed to execute RFI */

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	rsm PSW_SM_I, %r0

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	nop

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	nop

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	nop

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	nop

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	nop

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	nop

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	nop

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	rsm PSW_SM_Q, %r0

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	nop

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	nop

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	nop

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	nop

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	nop

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	nop

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	nop

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	/*

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	 * After return-from-interrupt, we want to run without Code/Data

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	 * translation enabled just like on a normal boot.

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	 */

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	/* calculate new physical execution address */

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	ldo	1f-0b(%arg2), %r1

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	mtctl	%r0, %cr17 /* IIASQ */

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	mtctl	%r0, %cr17 /* IIASQ */

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	mtctl	%r1, %cr18 /* IIAOQ */

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	ldo	4(%r1),%r1

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	mtctl	%r1, %cr18 /* IIAOQ */

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#ifdef CONFIG_64BIT

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	depdi,z	1, PSW_W_BIT, 1, %r1

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	mtctl	%r1, %cr22 /* IPSW */

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#else

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	mtctl	%r0, %cr22 /* IPSW */

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#endif

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	/* lets go... */

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	rfi

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1:	nop

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	nop

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.Lloop:

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	LDREG,ma	REG_SZ(%arg0), %r3

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	/* If crash kernel, no copy needed */

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	cmpib,COND(=),n 0,%r3,boot

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	bb,<,n		%r3, 31 - IND_DONE_BIT, boot

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	bb,>=,n		%r3, 31 - IND_INDIRECTION_BIT, .Lnotind

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	/* indirection, load and restart */

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	movb		%r3, %arg0, .Lloop

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	depi		0, 31, PAGE_SHIFT, %arg0

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.Lnotind:

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	bb,>=,n		%r3, 31 - IND_DESTINATION_BIT, .Lnotdest

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	b		.Lloop

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	copy		%r3, %r20

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.Lnotdest:

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	bb,>=		%r3, 31 - IND_SOURCE_BIT, .Lloop

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	depi		0, 31, PAGE_SHIFT, %r3

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	copy		%r3, %r21

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	/* copy page */

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	copy		%r0, %r18

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	zdepi		1, 31 - PAGE_SHIFT, 1, %r18

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	add		%r20, %r18, %r17

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	depi		0, 31, PAGE_SHIFT, %r20

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.Lcopy:

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	copy		%r20, %r12

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	LDREG,ma	REG_SZ(%r21), %r8

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	LDREG,ma	REG_SZ(%r21), %r9

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	LDREG,ma	REG_SZ(%r21), %r10

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	LDREG,ma	REG_SZ(%r21), %r11

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	STREG,ma	%r8, REG_SZ(%r20)

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	STREG,ma	%r9, REG_SZ(%r20)

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	STREG,ma	%r10, REG_SZ(%r20)

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	STREG,ma	%r11, REG_SZ(%r20)

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#ifndef CONFIG_64BIT

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	LDREG,ma	REG_SZ(%r21), %r8

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	LDREG,ma	REG_SZ(%r21), %r9

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	LDREG,ma	REG_SZ(%r21), %r10

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	LDREG,ma	REG_SZ(%r21), %r11

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	STREG,ma	%r8, REG_SZ(%r20)

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	STREG,ma	%r9, REG_SZ(%r20)

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	STREG,ma	%r10, REG_SZ(%r20)

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	STREG,ma	%r11, REG_SZ(%r20)

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#endif

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	fdc		%r0(%r12)

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	cmpb,COND(<<)	%r20,%r17,.Lcopy

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	fic		(%sr4, %r12)

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	b,n		.Lloop

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boot:

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	mtctl	%r0, %cr15

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	LDREG	kexec_free_mem-0b(%arg2), %arg0

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	LDREG	kexec_cmdline-0b(%arg2), %arg1

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	LDREG	kexec_initrd_end-0b(%arg2), %arg3

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	LDREG	kexec_initrd_start-0b(%arg2), %arg2

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	bv,n %r0(%rp)

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ENDPROC_CFI(relocate_new_kernel);

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ENTRY(relocate_new_kernel_size)

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       .word relocate_new_kernel_size - relocate_new_kernel

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kexec_param cmdline

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kexec_param initrd_start

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kexec_param initrd_end

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kexec_param free_mem

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