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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-09-27 17:12:39 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-12-09 22:41:16 +1100 |
| commit | 06e7cbc29e97b4713b4ea6def04ae8501a7d1a59 (patch) | |
| tree | f0de0597d2fc560245d65873fb998921a2b11831 | |
| parent | powerpc/microwatt: add POWER9_CPU, clear PPC_64S_HASH_MMU (diff) | |
| download | linux-dev-06e7cbc29e97b4713b4ea6def04ae8501a7d1a59.tar.xz linux-dev-06e7cbc29e97b4713b4ea6def04ae8501a7d1a59.zip | |
powerpc/40x: Map 32Mbytes of memory at startup
As reported by Carlo, 16Mbytes is not enough with modern kernels
that tend to be a bit big, so map another 16M page at boot.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/89b5f974a7fa5011206682cd092e2c905530ff46.1632755552.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | arch/powerpc/kernel/head_40x.S | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S index 7d72ee5ab387..e783860bea83 100644 --- a/arch/powerpc/kernel/head_40x.S +++ b/arch/powerpc/kernel/head_40x.S @@ -27,6 +27,7 @@ #include <linux/init.h> #include <linux/pgtable.h> +#include <linux/sizes.h> #include <asm/processor.h> #include <asm/page.h> #include <asm/mmu.h> @@ -650,7 +651,7 @@ start_here: b . /* prevent prefetch past rfi */ /* Set up the initial MMU state so we can do the first level of - * kernel initialization. This maps the first 16 MBytes of memory 1:1 + * kernel initialization. This maps the first 32 MBytes of memory 1:1 * virtual to physical and more importantly sets the cache mode. */ initial_mmu: @@ -687,6 +688,12 @@ initial_mmu: tlbwe r4,r0,TLB_DATA /* Load the data portion of the entry */ tlbwe r3,r0,TLB_TAG /* Load the tag portion of the entry */ + li r0,62 /* TLB slot 62 */ + addis r4,r4,SZ_16M@h + addis r3,r3,SZ_16M@h + tlbwe r4,r0,TLB_DATA /* Load the data portion of the entry */ + tlbwe r3,r0,TLB_TAG /* Load the tag portion of the entry */ + isync /* Establish the exception vector base |