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| author |  Jason Yan <yanaijie@huawei.com>
| 2019-09-20 17:45:39 +0800 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2019-11-13 19:27:37 +1100 |
| commit | c061b38a3e48663c29611e3b60afffe624d7c830 (patch) | |
| tree | 3ee9833247d61bebf813955f9d8aaa0a732d730f /arch/powerpc/kernel/head_fsl_booke.S | |
| parent | powerpc/fsl_booke/32: introduce create_kaslr_tlb_entry() helper (diff) | |
| download | linux-c061b38a3e48663c29611e3b60afffe624d7c830.tar.gz linux-c061b38a3e48663c29611e3b60afffe624d7c830.tar.bz2 linux-c061b38a3e48663c29611e3b60afffe624d7c830.zip | |
powerpc/fsl_booke/32: introduce reloc_kernel_entry() helper
Add a new helper reloc_kernel_entry() to jump back to the start of the
new kernel. After we put the new kernel in a randomized place we can use
this new helper to enter the kernel and begin to relocate again.
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Diana Craciun <diana.craciun@nxp.com>
Tested-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Scott Wood <oss@buserror.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/head_fsl_booke.S')
| -rw-r--r-- | arch/powerpc/kernel/head_fsl_booke.S | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index 8c1928176ffe..d9f599b01ff1 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -1150,6 +1150,19 @@ _GLOBAL(create_kaslr_tlb_entry) blr /* + * Return to the start of the relocated kernel and run again + * r3 - virtual address of fdt + * r4 - entry of the kernel + */ +_GLOBAL(reloc_kernel_entry) + mfmsr r7 + rlwinm r7, r7, 0, ~(MSR_IS | MSR_DS) + + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r7 + rfi + +/* * Create a tlb entry with the same effective and physical address as * the tlb entry used by the current running code. But set the TS to 1. * Then switch to the address space 1. It will return with the r3 set to |