From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH 14/27] ARM: mmu: alloc 64k for early page tables
Date: Fri, 12 May 2023 13:09:55 +0200 [thread overview]
Message-ID: <20230512111008.1120833-15-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20230512111008.1120833-1-s.hauer@pengutronix.de>
This is a preparation for using two level page tables in the PBL.
To do that we need a way to allocate page tables in PBL. As malloc
is not available in PBL, increase the area we use for the TTB to
make some space available for page tables.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
arch/arm/cpu/mmu_32.c | 6 ++++++
arch/arm/include/asm/barebox-arm.h | 8 ++------
2 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/arch/arm/cpu/mmu_32.c b/arch/arm/cpu/mmu_32.c
index 12fe892400..4050d96846 100644
--- a/arch/arm/cpu/mmu_32.c
+++ b/arch/arm/cpu/mmu_32.c
@@ -24,6 +24,12 @@
#define PTRS_PER_PTE (PGDIR_SIZE / PAGE_SIZE)
#define ARCH_MAP_WRITECOMBINE ((unsigned)-1)
+/*
+ * We have a 4GiB address space split into 1MiB sections, with each
+ * section header taking 4 bytes
+ */
+#define ARM_TTB_SIZE (SZ_4G / SZ_1M * sizeof(u32))
+
static uint32_t *ttb;
/*
diff --git a/arch/arm/include/asm/barebox-arm.h b/arch/arm/include/asm/barebox-arm.h
index 711ccd2510..f3398e3902 100644
--- a/arch/arm/include/asm/barebox-arm.h
+++ b/arch/arm/include/asm/barebox-arm.h
@@ -23,11 +23,7 @@
#include <asm/reloc.h>
#include <linux/stringify.h>
-/*
- * We have a 4GiB address space split into 1MiB sections, with each
- * section header taking 4 bytes
- */
-#define ARM_TTB_SIZE (SZ_4G / SZ_1M * sizeof(u32))
+#define ARM_EARLY_PAGETABLE_SIZE SZ_64K
void __noreturn barebox_arm_entry(unsigned long membase, unsigned long memsize, void *boarddata);
@@ -90,7 +86,7 @@ static inline unsigned long arm_mem_ttb(unsigned long membase,
unsigned long endmem)
{
endmem = arm_mem_stack(membase, endmem);
- endmem = ALIGN_DOWN(endmem, ARM_TTB_SIZE) - ARM_TTB_SIZE;
+ endmem = ALIGN_DOWN(endmem, ARM_EARLY_PAGETABLE_SIZE) - ARM_EARLY_PAGETABLE_SIZE;
return endmem;
}
--
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 ` [PATCH 07/27] ARM: mmu: implement MAP_FAULT Sascha Hauer
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 ` Sascha Hauer [this message]
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
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