[PATCH 6/9] arm: Clarify memory layout calculation
Markus Pargmann
mpa at pengutronix.de
Wed Dec 2 05:48:48 PST 2015
The memory calculations used are all hardcoded into three different
files, start-pbl.c, uncompress.c and start.c. To make this more readable
and reliable, this patch gathers these information in barebox-arm.h with
static inline functions for the calculation of the memory offsets.
This patch also adds proper handling of different barebox/board data
sizes. Currently only 1MB+Alignment of RAM is reserved for Barebox and
board data. This could be too small for bigger devicetrees and barebox.
Signed-off-by: Markus Pargmann <mpa at pengutronix.de>
---
arch/arm/cpu/start-pbl.c | 14 ++++------
arch/arm/cpu/start.c | 48 +++++++++++++++++++---------------
arch/arm/cpu/uncompress.c | 31 ++++++++++------------
arch/arm/include/asm/barebox-arm.h | 53 ++++++++++++++++++++++++++------------
4 files changed, 82 insertions(+), 64 deletions(-)
diff --git a/arch/arm/cpu/start-pbl.c b/arch/arm/cpu/start-pbl.c
index 2075ffeee75f..f723edc61318 100644
--- a/arch/arm/cpu/start-pbl.c
+++ b/arch/arm/cpu/start-pbl.c
@@ -54,8 +54,6 @@ __noreturn void barebox_single_pbl_start(unsigned long membase,
uint32_t endmem = membase + memsize;
unsigned long barebox_base;
- endmem -= STACK_SIZE; /* stack */
-
if (IS_ENABLED(CONFIG_PBL_RELOCATABLE))
relocate_to_current_adr();
@@ -67,7 +65,7 @@ __noreturn void barebox_single_pbl_start(unsigned long membase,
pg_len = pg_end - pg_start;
if (IS_ENABLED(CONFIG_RELOCATABLE))
- barebox_base = arm_barebox_image_place(membase + memsize);
+ barebox_base = arm_mem_barebox_image(membase, endmem, pg_len);
else
barebox_base = TEXT_BASE;
@@ -83,14 +81,12 @@ __noreturn void barebox_single_pbl_start(unsigned long membase,
setup_c();
if (IS_ENABLED(CONFIG_MMU_EARLY)) {
- endmem &= ~0x3fff;
- endmem -= SZ_16K; /* ttb */
- mmu_early_enable(membase, memsize, endmem);
+ unsigned long ttb = arm_mem_ttb(membase, endmem);
+ mmu_early_enable(membase, memsize, ttb);
}
- endmem -= SZ_128K; /* early malloc */
- free_mem_ptr = endmem;
- free_mem_end_ptr = free_mem_ptr + SZ_128K;
+ free_mem_ptr = arm_mem_early_malloc(membase, endmem);
+ free_mem_end_ptr = arm_mem_early_malloc_end(membase, endmem);
pbl_barebox_uncompress((void*)barebox_base, (void *)pg_start, pg_len);
diff --git a/arch/arm/cpu/start.c b/arch/arm/cpu/start.c
index c054f3c4400c..e06c4c8f37a0 100644
--- a/arch/arm/cpu/start.c
+++ b/arch/arm/cpu/start.c
@@ -104,14 +104,31 @@ void *barebox_arm_boot_dtb(void)
return barebox_boarddata;
}
+static inline unsigned long arm_mem_boarddata(unsigned long membase,
+ unsigned long endmem,
+ unsigned long size)
+{
+ unsigned long mem;
+
+ mem = arm_mem_barebox_image(membase, endmem, barebox_image_size);
+ mem -= ALIGN(size, 64);
+
+ return mem;
+}
+
__noreturn void barebox_non_pbl_start(unsigned long membase,
unsigned long memsize, void *boarddata)
{
unsigned long endmem = membase + memsize;
unsigned long malloc_start, malloc_end;
+ unsigned long barebox_size = barebox_image_size +
+ ((unsigned long)&__bss_stop - (unsigned long)&__bss_start);
+ unsigned long arm_head_bottom;
if (IS_ENABLED(CONFIG_RELOCATABLE)) {
- unsigned long barebox_base = arm_barebox_image_place(endmem);
+ unsigned long barebox_base = arm_mem_barebox_image(membase,
+ endmem,
+ barebox_size);
relocate_to_adr(barebox_base);
}
@@ -122,19 +139,16 @@ __noreturn void barebox_non_pbl_start(unsigned long membase,
pr_debug("memory at 0x%08lx, size 0x%08lx\n", membase, memsize);
arm_stack_top = endmem;
- endmem -= STACK_SIZE; /* Stack */
if (IS_ENABLED(CONFIG_MMU_EARLY)) {
-
- endmem &= ~0x3fff;
- endmem -= SZ_16K; /* ttb */
+ unsigned long ttb = arm_mem_ttb(membase, endmem);
if (IS_ENABLED(CONFIG_PBL_IMAGE)) {
arm_set_cache_functions();
} else {
- pr_debug("enabling MMU, ttb @ 0x%08lx\n", endmem);
+ pr_debug("enabling MMU, ttb @ 0x%08lx\n", ttb);
arm_early_mmu_cache_invalidate();
- mmu_early_enable(membase, memsize, endmem);
+ mmu_early_enable(membase, memsize, ttb);
}
}
@@ -155,24 +169,16 @@ __noreturn void barebox_non_pbl_start(unsigned long membase,
}
if (totalsize) {
- endmem -= ALIGN(totalsize, 64);
+ unsigned long mem = arm_mem_boarddata(membase, endmem,
+ totalsize);
pr_debug("found %s in boarddata, copying to 0x%lu\n",
- name, endmem);
- barebox_boarddata = memcpy((void *)endmem,
- boarddata, totalsize);
+ name, mem);
+ barebox_boarddata = memcpy((void *)mem, boarddata,
+ totalsize);
}
}
- if ((unsigned long)_text > membase + memsize ||
- (unsigned long)_text < membase)
- /*
- * barebox is either outside SDRAM or in another
- * memory bank, so we can use the whole bank for
- * malloc.
- */
- malloc_end = endmem;
- else
- malloc_end = (unsigned long)_text;
+ malloc_end = arm_head_bottom;
/*
* Maximum malloc space is the Kconfig value if given
diff --git a/arch/arm/cpu/uncompress.c b/arch/arm/cpu/uncompress.c
index dbf6b1e3f807..5bcce6b9e36d 100644
--- a/arch/arm/cpu/uncompress.c
+++ b/arch/arm/cpu/uncompress.c
@@ -52,8 +52,6 @@ void __noreturn barebox_multi_pbl_start(unsigned long membase,
void *pg_start;
unsigned long pc = get_pc();
- endmem -= STACK_SIZE; /* stack */
-
image_end = (void *)ld_var(__image_end) - get_runtime_offset();
if (IS_ENABLED(CONFIG_PBL_RELOCATABLE)) {
@@ -68,8 +66,16 @@ void __noreturn barebox_multi_pbl_start(unsigned long membase,
relocate_to_adr(membase);
}
+ /*
+ * image_end is the first location after the executable. It contains
+ * the size of the appended compressed binary followed by the binary.
+ */
+ pg_start = image_end + 1;
+ pg_len = *(image_end);
+
if (IS_ENABLED(CONFIG_RELOCATABLE))
- barebox_base = arm_barebox_image_place(membase + memsize);
+ barebox_base = arm_mem_barebox_image(membase, endmem,
+ pg_len);
else
barebox_base = TEXT_BASE;
@@ -78,22 +84,13 @@ void __noreturn barebox_multi_pbl_start(unsigned long membase,
pr_debug("memory at 0x%08lx, size 0x%08lx\n", membase, memsize);
if (IS_ENABLED(CONFIG_MMU_EARLY)) {
- endmem &= ~0x3fff;
- endmem -= SZ_16K; /* ttb */
- pr_debug("enabling MMU, ttb @ 0x%08x\n", endmem);
- mmu_early_enable(membase, memsize, endmem);
+ unsigned long ttb = arm_mem_ttb(membase, endmem);
+ pr_debug("enabling MMU, ttb @ 0x%08lx\n", ttb);
+ mmu_early_enable(membase, memsize, ttb);
}
- endmem -= SZ_128K; /* early malloc */
- free_mem_ptr = endmem;
- free_mem_end_ptr = free_mem_ptr + SZ_128K;
-
- /*
- * image_end is the first location after the executable. It contains
- * the size of the appended compressed binary followed by the binary.
- */
- pg_start = image_end + 1;
- pg_len = *(image_end);
+ free_mem_ptr = arm_mem_early_malloc(membase, endmem);
+ free_mem_end_ptr = arm_mem_early_malloc_end(membase, endmem);
pr_debug("uncompressing barebox binary at 0x%p (size 0x%08x) to 0x%08lx\n",
pg_start, pg_len, barebox_base);
diff --git a/arch/arm/include/asm/barebox-arm.h b/arch/arm/include/asm/barebox-arm.h
index 76e356413aec..da7717538b61 100644
--- a/arch/arm/include/asm/barebox-arm.h
+++ b/arch/arm/include/asm/barebox-arm.h
@@ -94,25 +94,44 @@ static inline void arm_fixup_vectors(void)
void *barebox_arm_boot_dtb(void);
-/*
- * For relocatable binaries find a suitable start address for the
- * relocated binary. Beginning at the memory end substract the reserved
- * space and round down a bit at the end. This is used by the pbl to
- * extract the image to a suitable place so that the uncompressed image
- * does not have to copy itself to another place. Also it's used by
- * the uncompressed image to relocate itself to the same place.
- */
-static inline unsigned long arm_barebox_image_place(unsigned long endmem)
+static inline unsigned long arm_mem_stack(unsigned long membase,
+ unsigned long endmem)
+{
+ return endmem - STACK_SIZE;
+}
+
+static inline unsigned long arm_mem_ttb(unsigned long membase,
+ unsigned long endmem)
+{
+ endmem = arm_mem_stack(membase, endmem);
+ endmem &= ~(SZ_16K - 1);
+ endmem -= SZ_16K;
+
+ return endmem;
+}
+
+static inline unsigned long arm_mem_early_malloc(unsigned long membase,
+ unsigned long endmem)
{
- endmem -= STACK_SIZE;
- endmem -= SZ_32K; /* ttb */
- endmem -= SZ_128K; /* early malloc */
- endmem -= SZ_1M; /* place for barebox image */
-
- /*
- * round down to make translating the objdump easier
- */
+ return arm_mem_ttb(membase, endmem) - SZ_128K;
+}
+
+static inline unsigned long arm_mem_early_malloc_end(unsigned long membase,
+ unsigned long endmem)
+{
+ return arm_mem_ttb(membase, endmem);
+}
+
+static inline unsigned long arm_mem_barebox_image(unsigned long membase,
+ unsigned long endmem,
+ unsigned long size)
+{
+ endmem = arm_mem_ttb(membase, endmem);
+
+#ifdef CONFIG_RELOCATABLE
+ endmem -= size;
endmem &= ~(SZ_1M - 1);
+#endif
return endmem;
}
--
2.6.2
More information about the barebox
mailing list