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| author | ian <ian@FreeBSD.org> | 2018-01-07 02:57:35 +0000 |
|---|---|---|
| committer | ian <ian@FreeBSD.org> | 2018-01-07 02:57:35 +0000 |
| commit | 5d2f271dce23b5fe8c1e6356380f228968343f2d (patch) | |
| tree | 627db19dd2727a8e3fb74e469ee04846e107d009 /sys/arm | |
| parent | cfbc744f148cc4b32cf4adcc3be23f92219ee80d (diff) | |
| download | FreeBSD-src-5d2f271dce23b5fe8c1e6356380f228968343f2d.zip FreeBSD-src-5d2f271dce23b5fe8c1e6356380f228968343f2d.tar.gz | |
MFC r327222:
Add a new ARM kernel option, LOCORE_MAP_MB, to control the size of the
kernel VA mapping in the temporary page tables set up by locore-v6.S.
The number used to be hard-coded to 64MB, which is still the default if
the kernel option is not specified. However, 64MB is insufficient for
using a large mdroot filesystem. The hard-coded number can't be safely
increased because too large a number may run into memory-mapped IO space
on some SoCs that must not be mapped as ordinary memory.
Diffstat (limited to 'sys/arm')
| -rw-r--r-- | sys/arm/arm/genassym.c | 9 | ||||
| -rw-r--r-- | sys/arm/arm/locore-v6.S | 11 |
2 files changed, 17 insertions, 3 deletions
diff --git a/sys/arm/arm/genassym.c b/sys/arm/arm/genassym.c index 3d11acd..b5cc952 100644 --- a/sys/arm/arm/genassym.c +++ b/sys/arm/arm/genassym.c @@ -161,3 +161,12 @@ ASSYM(DCACHE_LINE_SIZE, offsetof(struct cpuinfo, dcache_line_size)); ASSYM(DCACHE_LINE_MASK, offsetof(struct cpuinfo, dcache_line_mask)); ASSYM(ICACHE_LINE_SIZE, offsetof(struct cpuinfo, icache_line_size)); ASSYM(ICACHE_LINE_MASK, offsetof(struct cpuinfo, icache_line_mask)); + +/* + * Emit the LOCORE_MAP_MB option as a #define only if the option was set. + */ +#include "opt_locore.h" + +#ifdef LOCORE_MAP_MB +ASSYM(LOCORE_MAP_MB, LOCORE_MAP_MB); +#endif diff --git a/sys/arm/arm/locore-v6.S b/sys/arm/arm/locore-v6.S index 10aaace..775b867 100644 --- a/sys/arm/arm/locore-v6.S +++ b/sys/arm/arm/locore-v6.S @@ -38,6 +38,10 @@ __FBSDID("$FreeBSD$"); +/* We map 64MB of kernel unless overridden in assym.s by the kernel option. */ +#ifndef LOCORE_MAP_MB +#define LOCORE_MAP_MB 64 +#endif #if __ARM_ARCH >= 7 #if defined(__ARM_ARCH_7VE__) || defined(__clang__) @@ -172,12 +176,13 @@ ASENTRY_NP(_start) bl build_pagetables /* - * Next we do 64MiB starting at the physical load address, mapped to - * the VA the kernel is linked for. + * Next we map the kernel starting at the physical load address, mapped + * to the VA the kernel is linked for. The default size we map is 64MiB + * but it can be overridden with a kernel option. */ mov r1, r5 ldr r2, =(KERNVIRTADDR) - mov r3, #64 + ldr r3, =(LOCORE_MAP_MB) bl build_pagetables /* Create a device mapping for early_printf if specified. */ |
