150 lines
2.8 KiB
ArmAsm
150 lines
2.8 KiB
ArmAsm
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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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