Date: Tue, 26 Dec 2017 19:02:57 +0000 (UTC) From: Ian Lepore <ian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r327222 - in head/sys: arm/arm conf Message-ID: <201712261902.vBQJ2vrb042262@repo.freebsd.org>
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Author: ian Date: Tue Dec 26 19:02:56 2017 New Revision: 327222 URL: https://svnweb.freebsd.org/changeset/base/327222 Log: 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. Modified: head/sys/arm/arm/genassym.c head/sys/arm/arm/locore-v6.S head/sys/conf/options.arm Modified: head/sys/arm/arm/genassym.c ============================================================================== --- head/sys/arm/arm/genassym.c Tue Dec 26 18:42:29 2017 (r327221) +++ head/sys/arm/arm/genassym.c Tue Dec 26 19:02:56 2017 (r327222) @@ -161,3 +161,12 @@ ASSYM(DCACHE_LINE_SIZE, offsetof(struct cpuinfo, dcach 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 Modified: head/sys/arm/arm/locore-v6.S ============================================================================== --- head/sys/arm/arm/locore-v6.S Tue Dec 26 18:42:29 2017 (r327221) +++ head/sys/arm/arm/locore-v6.S Tue Dec 26 19:02:56 2017 (r327222) @@ -38,6 +38,11 @@ __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__) /* @@ -176,12 +181,13 @@ 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. */ Modified: head/sys/conf/options.arm ============================================================================== --- head/sys/conf/options.arm Tue Dec 26 18:42:29 2017 (r327221) +++ head/sys/conf/options.arm Tue Dec 26 19:02:56 2017 (r327222) @@ -35,6 +35,7 @@ KERNBASE opt_global.h KERNVIRTADDR opt_global.h LINUX_BOOT_ABI opt_global.h LOADERRAMADDR opt_global.h +LOCORE_MAP_MB opt_locore.h NKPT2PG opt_pmap.h PHYSADDR opt_global.h PLATFORM opt_global.h
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