Date: Tue, 8 Dec 2009 13:06:35 +0000 (UTC) From: Takahashi Yoshihiro <nyan@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r200255 - in head/sys/boot/pc98: libpc98 loader Message-ID: <200912081306.nB8D6Z4D088701@svn.freebsd.org>
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Author: nyan Date: Tue Dec 8 13:06:35 2009 New Revision: 200255 URL: http://svn.freebsd.org/changeset/base/200255 Log: MFi386: revision 200219 Improve the algorithm the loader uses to choose a memory range for its heap when using a range above 1MB. MFC after: 1 week Modified: head/sys/boot/pc98/libpc98/biosmem.c head/sys/boot/pc98/loader/main.c Modified: head/sys/boot/pc98/libpc98/biosmem.c ============================================================================== --- head/sys/boot/pc98/libpc98/biosmem.c Tue Dec 8 13:04:26 2009 (r200254) +++ head/sys/boot/pc98/libpc98/biosmem.c Tue Dec 8 13:06:35 2009 (r200255) @@ -34,8 +34,13 @@ __FBSDID("$FreeBSD$"); #include "libi386.h" #include "btxv86.h" -vm_offset_t memtop, memtop_copyin; -uint32_t bios_basemem, bios_extmem; +vm_offset_t memtop, memtop_copyin, high_heap_base; +uint32_t bios_basemem, bios_extmem, high_heap_size; + +/* + * The minimum amount of memory to reserve in bios_extmem for the heap. + */ +#define HEAP_MIN (3 * 1024 * 1024) void bios_getmem(void) @@ -48,4 +53,12 @@ bios_getmem(void) /* Set memtop to actual top of memory */ memtop = memtop_copyin = 0x100000 + bios_extmem; + /* + * If we have extended memory, use the last 3MB of 'extended' memory + * as a high heap candidate. + */ + if (bios_extmem >= HEAP_MIN) { + high_heap_size = HEAP_MIN; + high_heap_base = memtop - HEAP_MIN; + } } Modified: head/sys/boot/pc98/loader/main.c ============================================================================== --- head/sys/boot/pc98/loader/main.c Tue Dec 8 13:04:26 2009 (r200254) +++ head/sys/boot/pc98/loader/main.c Tue Dec 8 13:06:35 2009 (r200255) @@ -97,13 +97,17 @@ main(void) bios_getmem(); #if defined(LOADER_BZIP2_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 (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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