Le 17/07/2019 à 10:06, Jason Yan a écrit :
This patch add support to boot kernel from places other than KERNELBASE.
Since CONFIG_RELOCATABLE has already supported, what we need to do is
map or copy kernel to a proper place and relocate. Freescale Book-E
parts expect lowmem to be mapped by fixed TLB entries(TLB1). The TLB1
entries are not suitable to map the kernel directly in a randomized
region, so we chose to copy the kernel to a proper place and restart to
relocate.
The offset of the kernel was not randomized yet(a fixed 64M is set). We
will randomize it in the next patch.
Signed-off-by: Jason Yan <yanaijie@xxxxxxxxxx>
Cc: Diana Craciun <diana.craciun@xxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
---
arch/powerpc/Kconfig | 11 +++
arch/powerpc/kernel/Makefile | 1 +
arch/powerpc/kernel/early_32.c | 2 +-
arch/powerpc/kernel/fsl_booke_entry_mapping.S | 13 ++-
arch/powerpc/kernel/head_fsl_booke.S | 15 +++-
arch/powerpc/kernel/kaslr_booke.c | 83 +++++++++++++++++++
arch/powerpc/mm/mmu_decl.h | 6 ++
arch/powerpc/mm/nohash/fsl_booke.c | 7 +-
8 files changed, 125 insertions(+), 13 deletions(-)
create mode 100644 arch/powerpc/kernel/kaslr_booke.c
[...]
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index dae8e9177574..754ae1e69f92 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -148,6 +148,12 @@ extern void reloc_kernel_entry(void *fdt, int addr);
extern void loadcam_entry(unsigned int index);
extern void loadcam_multi(int first_idx, int num, int tmp_idx);
+#ifdef CONFIG_RANDOMIZE_BASE
+extern void kaslr_early_init(void *dt_ptr, phys_addr_t size);
No superflous 'extern' keyword.
Christophe
+#else
+static inline void kaslr_early_init(void *dt_ptr, phys_addr_t size) {}
+#endif
+
struct tlbcam {
u32 MAS0;
u32 MAS1;
