From: Jason Yan <yanaijie@huawei.com>
To: <mpe@ellerman.id.au>, <linuxppc-dev@lists.ozlabs.org>,
<diana.craciun@nxp.com>, <christophe.leroy@c-s.fr>,
<benh@kernel.crashing.org>, <paulus@samba.org>,
<npiggin@gmail.com>, <keescook@chromium.org>,
<kernel-hardening@lists.openwall.com>
Cc: <linux-kernel@vger.kernel.org>, <wangkefeng.wang@huawei.com>,
<yebin10@huawei.com>, <thunder.leizhen@huawei.com>,
<jingxiangfeng@huawei.com>, <fanchengyang@huawei.com>,
<zhaohongjiang@huawei.com>, Jason Yan <yanaijie@huawei.com>
Subject: [PATCH v3 04/10] powerpc/fsl_booke/32: introduce create_tlb_entry() helper
Date: Wed, 31 Jul 2019 17:43:12 +0800 [thread overview]
Message-ID: <20190731094318.26538-5-yanaijie@huawei.com> (raw)
In-Reply-To: <20190731094318.26538-1-yanaijie@huawei.com>
Add a new helper create_tlb_entry() to create a tlb entry by the virtual
and physical address. This is a preparation to support boot kernel at a
randomized address.
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Cc: Diana Craciun <diana.craciun@nxp.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_fsl_booke.S | 29 ++++++++++++++++++++++++++++
arch/powerpc/mm/mmu_decl.h | 1 +
2 files changed, 30 insertions(+)
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index adf0505dbe02..04d124fee17d 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -1114,6 +1114,35 @@ __secondary_hold_acknowledge:
.long -1
#endif
+/*
+ * Create a 64M tlb by address and entry
+ * r3/r4 - physical address
+ * r5 - virtual address
+ * r6 - entry
+ */
+_GLOBAL(create_tlb_entry)
+ lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
+ rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
+ mtspr SPRN_MAS0,r7 /* Write MAS0 */
+
+ lis r6,(MAS1_VALID|MAS1_IPROT)@h
+ ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_64M))@l
+ mtspr SPRN_MAS1,r6 /* Write MAS1 */
+
+ lis r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@h
+ ori r6,r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@l
+ and r6,r6,r5
+ ori r6,r6,MAS2_M@l
+ mtspr SPRN_MAS2,r6 /* Write MAS2(EPN) */
+
+ ori r8,r4,(MAS3_SW|MAS3_SR|MAS3_SX)
+ mtspr SPRN_MAS3,r8 /* Write MAS3(RPN) */
+
+ tlbwe /* Write TLB */
+ isync
+ sync
+ blr
+
/*
* 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.
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index 32c1a191c28a..a09f89d3aa0f 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -142,6 +142,7 @@ extern unsigned long calc_cam_sz(unsigned long ram, unsigned long virt,
extern void adjust_total_lowmem(void);
extern int switch_to_as1(void);
extern void restore_to_as0(int esel, int offset, void *dt_ptr, int bootcpu);
+void create_tlb_entry(phys_addr_t phys, unsigned long virt, int entry);
#endif
extern void loadcam_entry(unsigned int index);
extern void loadcam_multi(int first_idx, int num, int tmp_idx);
--
2.17.2
next prev parent reply other threads:[~2019-07-31 9:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-31 9:43 [PATCH v3 00/10] implement KASLR for powerpc/fsl_booke/32 Jason Yan
2019-07-31 9:43 ` [PATCH v3 01/10] powerpc: unify definition of M_IF_NEEDED Jason Yan
2019-07-31 9:43 ` [PATCH v3 02/10] powerpc: move memstart_addr and kernstart_addr to init-common.c Jason Yan
2019-07-31 9:43 ` [PATCH v3 03/10] powerpc: introduce kimage_vaddr to store the kernel base Jason Yan
2019-07-31 9:43 ` Jason Yan [this message]
2019-07-31 9:43 ` [PATCH v3 05/10] powerpc/fsl_booke/32: introduce reloc_kernel_entry() helper Jason Yan
2019-07-31 9:43 ` [PATCH v3 06/10] powerpc/fsl_booke/32: implement KASLR infrastructure Jason Yan
2019-08-02 8:41 ` Diana Madalina Craciun
2019-08-05 5:40 ` Jason Yan
2019-07-31 9:43 ` [PATCH v3 07/10] powerpc/fsl_booke/32: randomize the kernel image offset Jason Yan
2019-07-31 9:43 ` [PATCH v3 08/10] powerpc/fsl_booke/kaslr: clear the original kernel if randomized Jason Yan
2019-07-31 9:43 ` [PATCH v3 09/10] powerpc/fsl_booke/kaslr: support nokaslr cmdline parameter Jason Yan
2019-07-31 9:43 ` [PATCH v3 10/10] powerpc/fsl_booke/kaslr: dump out kernel offset information on panic Jason Yan
2019-08-01 14:36 ` [PATCH v3 00/10] implement KASLR for powerpc/fsl_booke/32 Diana Madalina Craciun
2019-08-02 0:48 ` Jason Yan
2019-08-02 8:48 ` Diana Madalina Craciun
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