Date: Fri, 18 Dec 2009 20:28:29 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org Subject: svn commit: r200687 - in stable/7/sys/boot/i386: libi386 loader Message-ID: <200912182028.nBIKSTkA007724@svn.freebsd.org>
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Author: jhb Date: Fri Dec 18 20:28:28 2009 New Revision: 200687 URL: http://svn.freebsd.org/changeset/base/200687 Log: MFC 200216,200219: - Various small whitespace and style fixes. - Improve the algorithm the loader uses to choose a memory range for its heap when using a range above 1MB. Modified: stable/7/sys/boot/i386/libi386/biosmem.c stable/7/sys/boot/i386/libi386/libi386.h stable/7/sys/boot/i386/loader/main.c Directory Properties: stable/7/sys/ (props changed) stable/7/sys/cddl/contrib/opensolaris/ (props changed) stable/7/sys/contrib/dev/acpica/ (props changed) stable/7/sys/contrib/pf/ (props changed) Modified: stable/7/sys/boot/i386/libi386/biosmem.c ============================================================================== --- stable/7/sys/boot/i386/libi386/biosmem.c Fri Dec 18 20:28:04 2009 (r200686) +++ stable/7/sys/boot/i386/libi386/biosmem.c Fri Dec 18 20:28:28 2009 (r200687) @@ -35,14 +35,20 @@ __FBSDID("$FreeBSD$"); #include "libi386.h" #include "btxv86.h" -vm_offset_t memtop, memtop_copyin; -u_int32_t bios_basemem, bios_extmem; +vm_offset_t memtop, memtop_copyin, high_heap_base; +uint32_t bios_basemem, bios_extmem, high_heap_size; static struct bios_smap smap; +/* + * The minimum amount of memory to reserve in bios_extmem for the heap. + */ +#define HEAP_MIN (3 * 1024 * 1024) + void bios_getmem(void) { + uint64_t size; /* Parse system memory map */ v86.ebx = 0; @@ -65,6 +71,26 @@ bios_getmem(void) if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0x100000)) { bios_extmem = smap.length; } + + /* + * Look for the largest segment in 'extended' memory beyond + * 1MB but below 4GB. + */ + if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base > 0x100000) && + (smap.base < 0x100000000ull)) { + size = smap.length; + + /* + * If this segment crosses the 4GB boundary, truncate it. + */ + if (smap.base + size > 0x100000000ull) + size = 0x100000000ull - smap.base; + + if (size > high_heap_size) { + high_heap_size = size; + high_heap_base = smap.base; + } + } } while (v86.ebx != 0); /* Fall back to the old compatibility function for base memory */ @@ -97,5 +123,13 @@ bios_getmem(void) /* Set memtop to actual top of memory */ memtop = memtop_copyin = 0x100000 + bios_extmem; + /* + * If we have extended memory and did not find a suitable heap + * region in the SMAP, use the last 3MB of 'extended' memory as a + * high heap candidate. + */ + if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) { + high_heap_size = HEAP_MIN; + high_heap_base = memtop - HEAP_MIN; + } } - Modified: stable/7/sys/boot/i386/libi386/libi386.h ============================================================================== --- stable/7/sys/boot/i386/libi386/libi386.h Fri Dec 18 20:28:04 2009 (r200686) +++ stable/7/sys/boot/i386/libi386/libi386.h Fri Dec 18 20:28:28 2009 (r200687) @@ -78,9 +78,9 @@ int bc_add(int biosdev); /* Register CD int bc_getdev(struct i386_devdesc *dev); /* return dev_t for (dev) */ int bc_bios2unit(int biosdev); /* xlate BIOS device -> bioscd unit */ int bc_unit2bios(int unit); /* xlate bioscd unit -> BIOS device */ -u_int32_t bd_getbigeom(int bunit); /* return geometry in bootinfo format */ -int bd_bios2unit(int biosdev); /* xlate BIOS device -> biosdisk unit */ -int bd_unit2bios(int unit); /* xlate biosdisk unit -> BIOS device */ +uint32_t bd_getbigeom(int bunit); /* return geometry in bootinfo format */ +int bd_bios2unit(int biosdev); /* xlate BIOS device -> biosdisk unit */ +int bd_unit2bios(int unit); /* xlate biosdisk unit -> BIOS device */ int bd_getdev(struct i386_devdesc *dev); /* return dev_t for (dev) */ ssize_t i386_copyin(const void *src, vm_offset_t dest, const size_t len); @@ -92,12 +92,15 @@ void bios_addsmapdata(struct preloaded_f void bios_getsmap(void); void bios_getmem(void); -extern u_int32_t bios_basemem; /* base memory in bytes */ -extern u_int32_t bios_extmem; /* extended memory in bytes */ +extern uint32_t bios_basemem; /* base memory in bytes */ +extern uint32_t bios_extmem; /* extended memory in bytes */ extern vm_offset_t memtop; /* last address of physical memory + 1 */ extern vm_offset_t memtop_copyin; /* memtop less heap size for the cases */ - /* when heap is at the top of extended memory */ - /* for other cases - just the same as memtop */ + /* when heap is at the top of */ + /* extended memory; for other cases */ + /* just the same as memtop */ +extern uint32_t high_heap_size; /* extended memory region available */ +extern vm_offset_t high_heap_base; /* for use as the heap */ int biospci_find_devclass(uint32_t class, int index, uint32_t *locator); int biospci_write_config(uint32_t locator, int offset, int width, uint32_t val); Modified: stable/7/sys/boot/i386/loader/main.c ============================================================================== --- stable/7/sys/boot/i386/loader/main.c Fri Dec 18 20:28:04 2009 (r200686) +++ stable/7/sys/boot/i386/loader/main.c Fri Dec 18 20:28:28 2009 (r200687) @@ -102,14 +102,19 @@ main(void) */ bios_getmem(); -#if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT) - heap_top = PTOV(memtop_copyin); - memtop_copyin -= 0x300000; - heap_bottom = PTOV(memtop_copyin); -#else - heap_top = (void *)bios_basemem; - heap_bottom = (void *)end; +#if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \ + defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT) + if (high_heap_size > 0) { + heap_top = PTOV(high_heap_base + high_heap_size); + heap_bottom = PTOV(high_heap_base); + if (high_heap_base < memtop_copyin) + memtop_copyin = high_heap_base; + } else #endif + { + heap_top = (void *)PTOV(bios_basemem); + heap_bottom = (void *)end; + } setheap(heap_bottom, heap_top); /*
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