2 * relocate_kernel.S for kexec
3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006
5 * This source code is licensed under the GNU General Public License,
6 * Version 2. See the file COPYING for more details.
10 #include <asm/asmmacro.h>
11 #include <asm/regdef.h>
13 #include <asm/mipsregs.h>
14 #include <asm/stackframe.h>
15 #include <asm/addrspace.h>
17 LEAF(relocate_new_kernel)
23 PTR_L s0, kexec_indirection_page
24 PTR_L s1, kexec_start_address
30 /* destination page */
33 and s4, s2, ~0x1 /* store destination addr in s4 */
37 /* indirection page, update s0 */
51 beq s3, zero, process_entry
53 li s6, (1 << PAGE_SHIFT) / SZREG
56 /* copy page word by word */
62 beq s6, zero, process_entry
68 /* kexec_flag reset is signal to other CPUs what kernel
69 was moved to it's location. Note - we need relocated address
81 #ifdef CONFIG_CPU_CAVIUM_OCTEON
82 /* We need to flush I-cache before jumping to new kernel.
83 * Unfortunatelly, this code is cpu-specific.
94 /* jump to kexec_start_address */
96 END(relocate_new_kernel)
100 * Other CPUs should wait until code is relocated and
101 * then start at entry (?) point.
108 PTR_L s1, kexec_start_address
110 /* Non-relocated address works for args and kexec_start_address ( old
111 * kernel is not overwritten). But we need relocated address of
125 #ifdef CONFIG_CPU_CAVIUM_OCTEON
138 /* all PTR's must be aligned to 8 byte in 64-bit mode */
142 /* All parameters to new kernel are passed in registers a0-a3.
143 * kexec_args[0..3] are uses to prepare register values.
152 .size kexec_args,PTRSIZE*4
156 * Secondary CPUs may have different kernel parameters in
157 * their registers a0-a3. secondary_kexec_args[0..3] are used
158 * to prepare register values.
160 secondary_kexec_args:
161 EXPORT(secondary_kexec_args)
166 .size secondary_kexec_args,PTRSIZE*4
173 EXPORT(kexec_start_address)
175 .size kexec_start_address, PTRSIZE
177 kexec_indirection_page:
178 EXPORT(kexec_indirection_page)
180 .size kexec_indirection_page, PTRSIZE
182 relocate_new_kernel_end:
184 relocate_new_kernel_size:
185 EXPORT(relocate_new_kernel_size)
186 PTR relocate_new_kernel_end - relocate_new_kernel
187 .size relocate_new_kernel_size, PTRSIZE