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Linux/arch/arm/kernel/relocate_kernel.S

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Diff markup

Differences between /arch/arm/kernel/relocate_kernel.S (Architecture ppc) and /arch/mips/kernel/relocate_kernel.S (Architecture mips)


  1 /* SPDX-License-Identifier: GPL-2.0 */         !!   1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*                                                  2 /*
  3  * relocate_kernel.S - put the kernel image in !!   3  * relocate_kernel.S for kexec
                                                   >>   4  * Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006
  4  */                                                 5  */
  5                                                     6 
  6 #include <linux/linkage.h>                     !!   7 #include <asm/asm.h>
  7 #include <asm/assembler.h>                     !!   8 #include <asm/asmmacro.h>
  8 #include <asm/asm-offsets.h>                   !!   9 #include <asm/regdef.h>
  9 #include <asm/kexec.h>                         !!  10 #include <asm/mipsregs.h>
 10                                                !!  11 #include <asm/stackframe.h>
 11         .align  3       /* not needed for this !!  12 #include <asm/addrspace.h>
 12                                                !!  13 
 13 ENTRY(relocate_new_kernel)                     !!  14 #include <kernel-entry-init.h>
 14                                                !!  15 
 15         adr     r7, relocate_new_kernel_end    !!  16 LEAF(relocate_new_kernel)
 16         ldr     r0, [r7, #KEXEC_INDIR_PAGE]    !!  17         PTR_L a0,       arg0
 17         ldr     r1, [r7, #KEXEC_START_ADDR]    !!  18         PTR_L a1,       arg1
                                                   >>  19         PTR_L a2,       arg2
                                                   >>  20         PTR_L a3,       arg3
                                                   >>  21 
                                                   >>  22         PTR_L           s0, kexec_indirection_page
                                                   >>  23         PTR_L           s1, kexec_start_address
                                                   >>  24 
                                                   >>  25 process_entry:
                                                   >>  26         PTR_L           s2, (s0)
                                                   >>  27         PTR_ADDIU       s0, s0, SZREG
 18                                                    28 
 19         /*                                         29         /*
 20          * If there is no indirection page (we !!  30          * In case of a kdump/crash kernel, the indirection page is not
 21          * skip any relocation.                !!  31          * populated as the kernel is directly copied to a reserved location
 22          */                                        32          */
 23         cmp     r0, #0                         !!  33         beqz            s2, done
 24         beq     2f                             << 
 25                                                    34 
 26 0:      /* top, read another word for the indi !!  35         /* destination page */
 27         ldr     r3, [r0],#4                    !!  36         and             s3, s2, 0x1
                                                   >>  37         beq             s3, zero, 1f
                                                   >>  38         and             s4, s2, ~0x1    /* store destination addr in s4 */
                                                   >>  39         b               process_entry
 28                                                    40 
 29         /* Is it a destination page. Put desti << 
 30         tst     r3,#1                          << 
 31         beq     1f                             << 
 32         bic     r4,r3,#1                       << 
 33         b       0b                             << 
 34 1:                                                 41 1:
 35         /* Is it an indirection page */        !!  42         /* indirection page, update s0  */
 36         tst     r3,#2                          !!  43         and             s3, s2, 0x2
 37         beq     1f                             !!  44         beq             s3, zero, 1f
 38         bic     r0,r3,#2                       !!  45         and             s0, s2, ~0x2
 39         b       0b                             !!  46         b               process_entry
                                                   >>  47 
                                                   >>  48 1:
                                                   >>  49         /* done page */
                                                   >>  50         and             s3, s2, 0x4
                                                   >>  51         beq             s3, zero, 1f
                                                   >>  52         b               done
 40 1:                                                 53 1:
                                                   >>  54         /* source page */
                                                   >>  55         and             s3, s2, 0x8
                                                   >>  56         beq             s3, zero, process_entry
                                                   >>  57         and             s2, s2, ~0x8
                                                   >>  58         li              s6, (1 << _PAGE_SHIFT) / SZREG
                                                   >>  59 
                                                   >>  60 copy_word:
                                                   >>  61         /* copy page word by word */
                                                   >>  62         REG_L           s5, (s2)
                                                   >>  63         REG_S           s5, (s4)
                                                   >>  64         PTR_ADDIU       s4, s4, SZREG
                                                   >>  65         PTR_ADDIU       s2, s2, SZREG
                                                   >>  66         LONG_ADDIU      s6, s6, -1
                                                   >>  67         beq             s6, zero, process_entry
                                                   >>  68         b               copy_word
                                                   >>  69 
                                                   >>  70 done:
                                                   >>  71 #ifdef CONFIG_SMP
                                                   >>  72         /* kexec_flag reset is signal to other CPUs what kernel
                                                   >>  73            was moved to its location. Note - we need relocated address
                                                   >>  74            of kexec_flag.  */
                                                   >>  75 
                                                   >>  76         bal             1f
                                                   >>  77  1:     move            t1,ra;
                                                   >>  78         PTR_LA          t2,1b
                                                   >>  79         PTR_LA          t0,kexec_flag
                                                   >>  80         PTR_SUB         t0,t0,t2;
                                                   >>  81         PTR_ADD         t0,t1,t0;
                                                   >>  82         LONG_S          zero,(t0)
                                                   >>  83 #endif
                                                   >>  84 
                                                   >>  85 #ifdef CONFIG_CPU_CAVIUM_OCTEON
                                                   >>  86         /* We need to flush I-cache before jumping to new kernel.
                                                   >>  87          * Unfortunately, this code is cpu-specific.
                                                   >>  88          */
                                                   >>  89         .set push
                                                   >>  90         .set noreorder
                                                   >>  91         syncw
                                                   >>  92         syncw
                                                   >>  93         synci           0($0)
                                                   >>  94         .set pop
                                                   >>  95 #else
                                                   >>  96         sync
                                                   >>  97 #endif
                                                   >>  98         /* jump to kexec_start_address */
                                                   >>  99         j               s1
                                                   >> 100         END(relocate_new_kernel)
 41                                                   101 
 42         /* are we done ? */                    !! 102 #ifdef CONFIG_SMP
 43         tst     r3,#4                          !! 103 /*
 44         beq     1f                             !! 104  * Other CPUs should wait until code is relocated and
 45         b       2f                             !! 105  * then start at entry (?) point.
                                                   >> 106  */
                                                   >> 107 LEAF(kexec_smp_wait)
                                                   >> 108         PTR_L           a0, s_arg0
                                                   >> 109         PTR_L           a1, s_arg1
                                                   >> 110         PTR_L           a2, s_arg2
                                                   >> 111         PTR_L           a3, s_arg3
                                                   >> 112         PTR_L           s1, kexec_start_address
                                                   >> 113 
                                                   >> 114         /* Non-relocated address works for args and kexec_start_address ( old
                                                   >> 115          * kernel is not overwritten). But we need relocated address of
                                                   >> 116          * kexec_flag.
                                                   >> 117          */
 46                                                   118 
 47 1:                                             !! 119         bal             1f
 48         /* is it source ? */                   !! 120 1:      move            t1,ra;
 49         tst     r3,#8                          !! 121         PTR_LA          t2,1b
 50         beq     0b                             !! 122         PTR_LA          t0,kexec_flag
 51         bic r3,r3,#8                           !! 123         PTR_SUB         t0,t0,t2;
 52         mov r6,#1024                           !! 124         PTR_ADD         t0,t1,t0;
 53 9:                                             !! 125 
 54         ldr r5,[r3],#4                         !! 126 1:      LONG_L          s0, (t0)
 55         str r5,[r4],#4                         !! 127         bne             s0, zero,1b
 56         subs r6,r6,#1                          !! 128 
 57         bne 9b                                 !! 129 #ifdef USE_KEXEC_SMP_WAIT_FINAL
 58         b 0b                                   !! 130         kexec_smp_wait_final
 59                                                !! 131 #else
 60 2:                                             !! 132         sync
 61         /* Jump to relocated kernel */         !! 133 #endif
 62         mov     lr, r1                         !! 134         j               s1
 63         mov     r0, #0                         !! 135         END(kexec_smp_wait)
 64         ldr     r1, [r7, #KEXEC_MACH_TYPE]     !! 136 #endif
 65         ldr     r2, [r7, #KEXEC_R2]            !! 137 
 66  ARM(   ret     lr      )                      !! 138 #ifdef __mips64
 67  THUMB( bx      lr      )                      !! 139        /* all PTR's must be aligned to 8 byte in 64-bit mode */
                                                   >> 140        .align  3
                                                   >> 141 #endif
 68                                                   142 
 69 ENDPROC(relocate_new_kernel)                   !! 143 /* All parameters to new kernel are passed in registers a0-a3.
                                                   >> 144  * kexec_args[0..3] are used to prepare register values.
                                                   >> 145  */
 70                                                   146 
 71         .align  3                              !! 147 EXPORT(kexec_args)
 72 relocate_new_kernel_end:                       !! 148 arg0:   PTR_WD          0x0
                                                   >> 149 arg1:   PTR_WD          0x0
                                                   >> 150 arg2:   PTR_WD          0x0
                                                   >> 151 arg3:   PTR_WD          0x0
                                                   >> 152         .size   kexec_args,PTRSIZE*4
 73                                                   153 
 74         .globl relocate_new_kernel_size        !! 154 #ifdef CONFIG_SMP
 75 relocate_new_kernel_size:                      !! 155 /*
 76         .long relocate_new_kernel_end - reloca !! 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.
                                                   >> 159  */
                                                   >> 160 EXPORT(secondary_kexec_args)
                                                   >> 161 s_arg0: PTR_WD          0x0
                                                   >> 162 s_arg1: PTR_WD          0x0
                                                   >> 163 s_arg2: PTR_WD          0x0
                                                   >> 164 s_arg3: PTR_WD          0x0
                                                   >> 165         .size   secondary_kexec_args,PTRSIZE*4
                                                   >> 166 kexec_flag:
                                                   >> 167         LONG            0x1
                                                   >> 168 
                                                   >> 169 #endif
                                                   >> 170 
                                                   >> 171 EXPORT(kexec_start_address)
                                                   >> 172         PTR_WD          0x0
                                                   >> 173         .size           kexec_start_address, PTRSIZE
                                                   >> 174 
                                                   >> 175 EXPORT(kexec_indirection_page)
                                                   >> 176         PTR_WD          0
                                                   >> 177         .size           kexec_indirection_page, PTRSIZE
 77                                                   178 
                                                   >> 179 relocate_new_kernel_end:
 78                                                   180 
                                                   >> 181 EXPORT(relocate_new_kernel_size)
                                                   >> 182         PTR_WD          relocate_new_kernel_end - relocate_new_kernel
                                                   >> 183         .size           relocate_new_kernel_size, PTRSIZE
                                                      

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