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192 lines
3.7 KiB
192 lines
3.7 KiB
/*
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* relocate_kernel.S for kexec
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* Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/regdef.h>
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#include <asm/mipsregs.h>
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#include <asm/stackframe.h>
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#include <asm/addrspace.h>
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LEAF(relocate_new_kernel)
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PTR_L a0, arg0
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PTR_L a1, arg1
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PTR_L a2, arg2
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PTR_L a3, arg3
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PTR_L s0, kexec_indirection_page
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PTR_L s1, kexec_start_address
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process_entry:
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PTR_L s2, (s0)
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PTR_ADDIU s0, s0, SZREG
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/*
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* In case of a kdump/crash kernel, the indirection page is not
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* populated as the kernel is directly copied to a reserved location
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*/
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beqz s2, done
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/* destination page */
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and s3, s2, 0x1
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beq s3, zero, 1f
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and s4, s2, ~0x1 /* store destination addr in s4 */
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b process_entry
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1:
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/* indirection page, update s0 */
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and s3, s2, 0x2
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beq s3, zero, 1f
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and s0, s2, ~0x2
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b process_entry
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1:
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/* done page */
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and s3, s2, 0x4
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beq s3, zero, 1f
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b done
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1:
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/* source page */
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and s3, s2, 0x8
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beq s3, zero, process_entry
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and s2, s2, ~0x8
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li s6, (1 << _PAGE_SHIFT) / SZREG
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copy_word:
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/* copy page word by word */
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REG_L s5, (s2)
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REG_S s5, (s4)
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PTR_ADDIU s4, s4, SZREG
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PTR_ADDIU s2, s2, SZREG
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LONG_ADDIU s6, s6, -1
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beq s6, zero, process_entry
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b copy_word
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b process_entry
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done:
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#ifdef CONFIG_SMP
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/* kexec_flag reset is signal to other CPUs what kernel
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was moved to it's location. Note - we need relocated address
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of kexec_flag. */
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bal 1f
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1: move t1,ra;
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PTR_LA t2,1b
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PTR_LA t0,kexec_flag
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PTR_SUB t0,t0,t2;
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PTR_ADD t0,t1,t0;
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LONG_S zero,(t0)
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#endif
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#ifdef CONFIG_CPU_CAVIUM_OCTEON
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/* We need to flush I-cache before jumping to new kernel.
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* Unfortunatelly, this code is cpu-specific.
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*/
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.set push
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.set noreorder
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syncw
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syncw
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synci 0($0)
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.set pop
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#else
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sync
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#endif
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/* jump to kexec_start_address */
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j s1
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END(relocate_new_kernel)
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#ifdef CONFIG_SMP
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/*
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* Other CPUs should wait until code is relocated and
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* then start at entry (?) point.
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*/
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LEAF(kexec_smp_wait)
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PTR_L a0, s_arg0
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PTR_L a1, s_arg1
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PTR_L a2, s_arg2
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PTR_L a3, s_arg3
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PTR_L s1, kexec_start_address
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/* Non-relocated address works for args and kexec_start_address ( old
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* kernel is not overwritten). But we need relocated address of
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* kexec_flag.
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*/
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bal 1f
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1: move t1,ra;
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PTR_LA t2,1b
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PTR_LA t0,kexec_flag
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PTR_SUB t0,t0,t2;
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PTR_ADD t0,t1,t0;
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1: LONG_L s0, (t0)
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bne s0, zero,1b
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#ifdef CONFIG_CPU_CAVIUM_OCTEON
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.set push
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.set noreorder
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synci 0($0)
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.set pop
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#else
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sync
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#endif
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j s1
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END(kexec_smp_wait)
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#endif
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#ifdef __mips64
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/* all PTR's must be aligned to 8 byte in 64-bit mode */
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.align 3
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#endif
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/* All parameters to new kernel are passed in registers a0-a3.
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* kexec_args[0..3] are uses to prepare register values.
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*/
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kexec_args:
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EXPORT(kexec_args)
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arg0: PTR 0x0
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arg1: PTR 0x0
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arg2: PTR 0x0
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arg3: PTR 0x0
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.size kexec_args,PTRSIZE*4
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#ifdef CONFIG_SMP
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/*
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* Secondary CPUs may have different kernel parameters in
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* their registers a0-a3. secondary_kexec_args[0..3] are used
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* to prepare register values.
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*/
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secondary_kexec_args:
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EXPORT(secondary_kexec_args)
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s_arg0: PTR 0x0
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s_arg1: PTR 0x0
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s_arg2: PTR 0x0
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s_arg3: PTR 0x0
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.size secondary_kexec_args,PTRSIZE*4
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kexec_flag:
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LONG 0x1
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#endif
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kexec_start_address:
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EXPORT(kexec_start_address)
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PTR 0x0
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.size kexec_start_address, PTRSIZE
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kexec_indirection_page:
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EXPORT(kexec_indirection_page)
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PTR 0
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.size kexec_indirection_page, PTRSIZE
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relocate_new_kernel_end:
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relocate_new_kernel_size:
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EXPORT(relocate_new_kernel_size)
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PTR relocate_new_kernel_end - relocate_new_kernel
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.size relocate_new_kernel_size, PTRSIZE
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