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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184/* SPDX-License-Identifier: GPL-2.0-only *//* * relocate_kernel.S for kexec * Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006 */
#include <asm/asm.h>#include <asm/asmmacro.h>#include <asm/regdef.h>#include <asm/mipsregs.h>#include <asm/stackframe.h>#include <asm/addrspace.h>
#include <kernel-entry-init.h>
LEAF(relocate_new_kernel) PTR_L a0, arg0 PTR_L a1, arg1 PTR_L a2, arg2 PTR_L a3, arg3
PTR_L s0, kexec_indirection_page PTR_L s1, kexec_start_address
process_entry: PTR_L s2, (s0) PTR_ADDIU s0, s0, SZREG
/* * In case of a kdump/crash kernel, the indirection page is not * populated as the kernel is directly copied to a reserved location */ beqz s2, done
/* destination page */ and s3, s2, 0x1 beq s3, zero, 1f and s4, s2, ~0x1 /* store destination addr in s4 */ b process_entry
1: /* indirection page, update s0 */ and s3, s2, 0x2 beq s3, zero, 1f and s0, s2, ~0x2 b process_entry
1: /* done page */ and s3, s2, 0x4 beq s3, zero, 1f b done1: /* source page */ and s3, s2, 0x8 beq s3, zero, process_entry and s2, s2, ~0x8 li s6, (1 << _PAGE_SHIFT) / SZREG
copy_word: /* copy page word by word */ REG_L s5, (s2) REG_S s5, (s4) PTR_ADDIU s4, s4, SZREG PTR_ADDIU s2, s2, SZREG LONG_ADDIU s6, s6, -1 beq s6, zero, process_entry b copy_word
done:#ifdef CONFIG_SMP /* kexec_flag reset is signal to other CPUs what kernel was moved to its location. Note - we need relocated address of kexec_flag. */
bal 1f 1: move t1,ra; PTR_LA t2,1b PTR_LA t0,kexec_flag PTR_SUB t0,t0,t2; PTR_ADD t0,t1,t0; LONG_S zero,(t0)#endif
#ifdef CONFIG_CPU_CAVIUM_OCTEON /* We need to flush I-cache before jumping to new kernel. * Unfortunately, this code is cpu-specific. */ .set push .set noreorder syncw syncw synci 0($0) .set pop#else sync#endif /* jump to kexec_start_address */ j s1 END(relocate_new_kernel)
#ifdef CONFIG_SMP/* * Other CPUs should wait until code is relocated and * then start at entry (?) point. */LEAF(kexec_smp_wait) PTR_L a0, s_arg0 PTR_L a1, s_arg1 PTR_L a2, s_arg2 PTR_L a3, s_arg3 PTR_L s1, kexec_start_address
/* Non-relocated address works for args and kexec_start_address ( old * kernel is not overwritten). But we need relocated address of * kexec_flag. */
bal 1f1: move t1,ra; PTR_LA t2,1b PTR_LA t0,kexec_flag PTR_SUB t0,t0,t2; PTR_ADD t0,t1,t0;
1: LONG_L s0, (t0) bne s0, zero,1b
#ifdef USE_KEXEC_SMP_WAIT_FINAL kexec_smp_wait_final#else sync#endif j s1 END(kexec_smp_wait)#endif
#ifdef __mips64 /* all PTR's must be aligned to 8 byte in 64-bit mode */ .align 3#endif
/* All parameters to new kernel are passed in registers a0-a3. * kexec_args[0..3] are used to prepare register values. */
EXPORT(kexec_args)arg0: PTR_WD 0x0arg1: PTR_WD 0x0arg2: PTR_WD 0x0arg3: PTR_WD 0x0 .size kexec_args,PTRSIZE*4
#ifdef CONFIG_SMP/* * Secondary CPUs may have different kernel parameters in * their registers a0-a3. secondary_kexec_args[0..3] are used * to prepare register values. */EXPORT(secondary_kexec_args)s_arg0: PTR_WD 0x0s_arg1: PTR_WD 0x0s_arg2: PTR_WD 0x0s_arg3: PTR_WD 0x0 .size secondary_kexec_args,PTRSIZE*4kexec_flag: LONG 0x1
#endif
EXPORT(kexec_start_address) PTR_WD 0x0 .size kexec_start_address, PTRSIZE
EXPORT(kexec_indirection_page) PTR_WD 0 .size kexec_indirection_page, PTRSIZE
relocate_new_kernel_end:
EXPORT(relocate_new_kernel_size) PTR_WD relocate_new_kernel_end - relocate_new_kernel .size relocate_new_kernel_size, PTRSIZE