diff options
| author | Kevin Hao <haokexin@gmail.com> | 2013-12-24 08:12:06 +0100 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-01-10 00:52:16 +0100 |
| commit | dd189692d40948d6445bbaeb8cb9bf9d15f54dc6 (patch) | |
| tree | a52bf15f5aaa9cecb53efe0cd2bdf3bcc9c463ef /arch/powerpc/kernel/head_fsl_booke.S | |
| parent | powerpc: introduce macro LOAD_REG_ADDR_PIC (diff) | |
| download | linux-dd189692d40948d6445bbaeb8cb9bf9d15f54dc6.tar.xz linux-dd189692d40948d6445bbaeb8cb9bf9d15f54dc6.zip | |
powerpc: enable the relocatable support for the fsl booke 32bit kernel
This is based on the codes in the head_44x.S. The difference is that
the init tlb size we used is 64M. With this patch we can only load the
kernel at address between memstart_addr ~ memstart_addr + 64M. We will
fix this restriction in the following patches.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/kernel/head_fsl_booke.S')
| -rw-r--r-- | arch/powerpc/kernel/head_fsl_booke.S | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index 196950f29c00..19bd574bda9d 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -73,6 +73,30 @@ _ENTRY(_start); li r24,0 /* CPU number */ li r23,0 /* phys kernel start (high) */ +#ifdef CONFIG_RELOCATABLE + LOAD_REG_ADDR_PIC(r3, _stext) /* Get our current runtime base */ + + /* Translate _stext address to physical, save in r23/r25 */ + bl get_phys_addr + mr r23,r3 + mr r25,r4 + + /* + * We have the runtime (virutal) address of our base. + * We calculate our shift of offset from a 64M page. + * We could map the 64M page we belong to at PAGE_OFFSET and + * get going from there. + */ + lis r4,KERNELBASE@h + ori r4,r4,KERNELBASE@l + rlwinm r6,r25,0,0x3ffffff /* r6 = PHYS_START % 64M */ + rlwinm r5,r4,0,0x3ffffff /* r5 = KERNELBASE % 64M */ + subf r3,r5,r6 /* r3 = r6 - r5 */ + add r3,r4,r3 /* Required Virtual Address */ + + bl relocate +#endif + /* We try to not make any assumptions about how the boot loader * setup or used the TLBs. We invalidate all mappings from the * boot loader and load a single entry in TLB1[0] to map the @@ -182,6 +206,16 @@ _ENTRY(__early_start) bl early_init +#ifdef CONFIG_RELOCATABLE +#ifdef CONFIG_PHYS_64BIT + mr r3,r23 + mr r4,r25 +#else + mr r3,r25 +#endif + bl relocate_init +#endif + #ifdef CONFIG_DYNAMIC_MEMSTART lis r3,kernstart_addr@ha la r3,kernstart_addr@l(r3) |