diff mbox series

[v2,12/16] powerpc/kuap: Wire-up KUAP on 44x

Message ID 96c8f8d85233af9d883087237f4537405c72287f.1633707305.git.christophe.leroy@csgroup.eu (mailing list archive)
State Superseded
Headers show
Series powerpc: Add KUAP support for BOOKE and 40x | expand
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Commit Message

Christophe Leroy Oct. 8, 2021, 3:40 p.m. UTC 
This adds KUAP support to 44x. This is done by checking
the content of SPRN_PID at the time it is read and written
into SPRN_MMUCR.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/kernel/head_44x.S         | 16 ++++++++++++++++
 arch/powerpc/platforms/Kconfig.cputype |  1 +
 2 files changed, 17 insertions(+)
diff mbox series

Patch

diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index 02d2928d1e01..cf92a3434acd 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -334,6 +334,10 @@  interrupt_base:
 	mfspr	r12,SPRN_MMUCR
 	mfspr   r13,SPRN_PID		/* Get PID */
 	rlwimi	r12,r13,0,24,31		/* Set TID */
+#ifdef CONFIG_PPC_KUAP
+	cmpwi	r13,0
+	beq	2f			/* KUAP Fault */
+#endif
 
 4:
 	mtspr	SPRN_MMUCR,r12
@@ -444,6 +448,10 @@  interrupt_base:
 	mfspr	r12,SPRN_MMUCR
 	mfspr   r13,SPRN_PID		/* Get PID */
 	rlwimi	r12,r13,0,24,31		/* Set TID */
+#ifdef CONFIG_PPC_KUAP
+	cmpwi	r13,0
+	beq	2f			/* KUAP Fault */
+#endif
 
 4:
 	mtspr	SPRN_MMUCR,r12
@@ -575,6 +583,10 @@  finish_tlb_load_44x:
 3:	mfspr	r11,SPRN_SPRG3
 	lwz	r11,PGDIR(r11)
 	mfspr   r12,SPRN_PID		/* Get PID */
+#ifdef CONFIG_PPC_KUAP
+	cmpwi	r12,0
+	beq	2f			/* KUAP Fault */
+#endif
 4:	mtspr	SPRN_MMUCR,r12		/* Set MMUCR */
 
 	/* Mask of required permission bits. Note that while we
@@ -672,6 +684,10 @@  finish_tlb_load_44x:
 3:	mfspr	r11,SPRN_SPRG_THREAD
 	lwz	r11,PGDIR(r11)
 	mfspr   r12,SPRN_PID		/* Get PID */
+#ifdef CONFIG_PPC_KUAP
+	cmpwi	r12,0
+	beq	2f			/* KUAP Fault */
+#endif
 4:	mtspr	SPRN_MMUCR,r12		/* Set MMUCR */
 
 	/* Make up the required permissions */
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index a66ab0a991f9..30091551ab24 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -62,6 +62,7 @@  config 44x
 	select HAVE_PCI
 	select PHYS_64BIT
 	select PPC_HAVE_KUEP
+	select PPC_HAVE_KUAP
 
 endchoice