From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH 07/27] ARM: mmu: implement MAP_FAULT
Date: Fri, 12 May 2023 13:09:48 +0200 [thread overview]
Message-ID: <20230512111008.1120833-8-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20230512111008.1120833-1-s.hauer@pengutronix.de>
MAP_FAULT can be used for the zero page to make it faulting.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
arch/arm/cpu/mmu_32.c | 4 ++++
arch/arm/cpu/mmu_64.c | 3 +++
include/mmu.h | 1 +
3 files changed, 8 insertions(+)
diff --git a/arch/arm/cpu/mmu_32.c b/arch/arm/cpu/mmu_32.c
index 8ec21ee1d2..a1ecc49f03 100644
--- a/arch/arm/cpu/mmu_32.c
+++ b/arch/arm/cpu/mmu_32.c
@@ -178,6 +178,10 @@ int arch_remap_range(void *start, size_t size, unsigned flags)
pte_flags = pte_flags_uncached;
pgd_flags = pgd_flags_uncached;
break;
+ case MAP_FAULT:
+ pte_flags = 0x0;
+ pgd_flags = 0x0;
+ break;
case ARCH_MAP_WRITECOMBINE:
pte_flags = pte_flags_wc;
pgd_flags = pgd_flags_wc;
diff --git a/arch/arm/cpu/mmu_64.c b/arch/arm/cpu/mmu_64.c
index f43ac9a121..a22e0c81ab 100644
--- a/arch/arm/cpu/mmu_64.c
+++ b/arch/arm/cpu/mmu_64.c
@@ -154,6 +154,9 @@ int arch_remap_range(void *_start, size_t size, unsigned flags)
case MAP_UNCACHED:
attrs = attrs_uncached_mem();
break;
+ case MAP_FAULT:
+ attrs = 0x0;
+ break;
default:
return -EINVAL;
}
diff --git a/include/mmu.h b/include/mmu.h
index 2e23853df3..2326cb215a 100644
--- a/include/mmu.h
+++ b/include/mmu.h
@@ -4,6 +4,7 @@
#define MAP_UNCACHED 0
#define MAP_CACHED 1
+#define MAP_FAULT 2
/*
* Depending on the architecture the default mapping can be
--
2.39.2
next prev parent reply other threads:[~2023-05-12 11:11 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-12 11:09 [PATCH 00/27] ARM: MMU rework Sascha Hauer
2023-05-12 11:09 ` [PATCH 01/27] ARM: fix scratch mem position with OP-TEE Sascha Hauer
2023-05-12 17:17 ` Ahmad Fatoum
2023-05-12 11:09 ` [PATCH 02/27] ARM: drop cache function initialization Sascha Hauer
2023-05-12 17:19 ` Ahmad Fatoum
2023-05-12 11:09 ` [PATCH 03/27] ARM: Add _32 suffix to aarch32 specific filenames Sascha Hauer
2023-05-12 17:21 ` Ahmad Fatoum
2023-05-12 11:09 ` [PATCH 04/27] ARM: cpu.c: remove unused include Sascha Hauer
2023-05-12 17:22 ` Ahmad Fatoum
2023-05-12 11:09 ` [PATCH 05/27] ARM: mmu-common.c: use common mmu include Sascha Hauer
2023-05-12 17:23 ` Ahmad Fatoum
2023-05-12 11:09 ` [PATCH 06/27] ARM: mmu32: rename mmu.h to mmu_32.h Sascha Hauer
2023-05-12 17:23 ` Ahmad Fatoum
2023-05-12 11:09 ` Sascha Hauer [this message]
2023-05-12 11:09 ` [PATCH 08/27] ARM: mmu64: Use arch_remap_range where possible Sascha Hauer
2023-05-12 17:40 ` Ahmad Fatoum
2023-05-12 11:09 ` [PATCH 09/27] ARM: mmu32: implement zero_page_*() Sascha Hauer
2023-05-12 11:09 ` [PATCH 10/27] ARM: i.MX: Drop HAB workaround Sascha Hauer
2023-05-12 18:09 ` Ahmad Fatoum
2023-05-16 8:23 ` Sascha Hauer
2023-05-12 11:09 ` [PATCH 11/27] ARM: Move early MMU after malloc initialization Sascha Hauer
2023-05-12 18:10 ` Ahmad Fatoum
2023-05-12 11:09 ` [PATCH 12/27] ARM: mmu: move dma_sync_single_for_device to extra file Sascha Hauer
2023-05-12 18:30 ` Ahmad Fatoum
2023-05-16 9:09 ` Sascha Hauer
2023-05-12 11:09 ` [PATCH 13/27] ARM: mmu: merge mmu-early_xx.c into mmu_xx.c Sascha Hauer
2023-05-12 11:09 ` [PATCH 14/27] ARM: mmu: alloc 64k for early page tables Sascha Hauer
2023-05-12 11:09 ` [PATCH 15/27] ARM: mmu32: create alloc_pte() Sascha Hauer
2023-05-12 11:09 ` [PATCH 16/27] ARM: mmu64: " Sascha Hauer
2023-05-12 11:09 ` [PATCH 17/27] ARM: mmu: drop ttb argument Sascha Hauer
2023-05-12 11:09 ` [PATCH 18/27] ARM: mmu: always do MMU initialization early when MMU is enabled Sascha Hauer
2023-05-12 11:10 ` [PATCH 19/27] ARM: mmu32: Assume MMU is on Sascha Hauer
2023-05-12 11:10 ` [PATCH 20/27] ARM: mmu32: Fix pmd_flags_to_pte() for ARMv4/5/6 Sascha Hauer
2023-05-12 11:10 ` [PATCH 21/27] ARM: mmu32: Add pte_flags_to_pmd() Sascha Hauer
2023-05-12 11:10 ` [PATCH 22/27] ARM: mmu32: add get_pte_flags, get_pmd_flags Sascha Hauer
2023-05-12 11:10 ` [PATCH 23/27] ARM: mmu32: move functions into c file Sascha Hauer
2023-05-12 11:10 ` [PATCH 24/27] ARM: mmu32: read TTB value from register Sascha Hauer
2023-05-12 11:10 ` [PATCH 25/27] ARM: mmu32: Use pages for early MMU setup Sascha Hauer
2023-05-12 11:10 ` [PATCH 26/27] ARM: mmu32: Skip reserved ranges during initialization Sascha Hauer
2023-05-12 11:10 ` [PATCH 27/27] ARM: mmu64: Use two level pagetables in early code Sascha Hauer
2023-05-16 10:55 ` Sascha Hauer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230512111008.1120833-8-s.hauer@pengutronix.de \
--to=s.hauer@pengutronix.de \
--cc=barebox@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox