powerpc/40x: Map 32Mbytes of memory at startup

[ Upstream commit 06e7cbc29e97b4713b4ea6def04ae8501a7d1a59 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 7d72ee5ab387c04623ea26537af8d970d263dd21..e783860bea838c6e08a3932ca962757330accb5b 100644 (file)
--- 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