/* 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	b		process_entry done:#ifdef CONFIG_SMP	/* kexec_flag reset is signal to other CPUs what kernel	   was moved to it's 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