[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [v3][PATCH 08/16] hvmloader/e820: construct guest e820 table
Now we can use that memory map to build our final e820 table but it may need to reorder all e820 entries. Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx> --- tools/firmware/hvmloader/e820.c | 62 +++++++++++++++++++++++++++++++---------- 1 file changed, 48 insertions(+), 14 deletions(-) diff --git a/tools/firmware/hvmloader/e820.c b/tools/firmware/hvmloader/e820.c index 2e05e93..c39b0aa 100644 --- a/tools/firmware/hvmloader/e820.c +++ b/tools/firmware/hvmloader/e820.c @@ -73,7 +73,8 @@ int build_e820_table(struct e820entry *e820, unsigned int lowmem_reserved_base, unsigned int bios_image_base) { - unsigned int nr = 0; + unsigned int nr = 0, i, j; + uint64_t low_mem_pgend = hvm_info->low_mem_pgend << PAGE_SHIFT; if ( !lowmem_reserved_base ) lowmem_reserved_base = 0xA0000; @@ -117,13 +118,6 @@ int build_e820_table(struct e820entry *e820, e820[nr].type = E820_RESERVED; nr++; - /* Low RAM goes here. Reserve space for special pages. */ - BUG_ON((hvm_info->low_mem_pgend << PAGE_SHIFT) < (2u << 20)); - e820[nr].addr = 0x100000; - e820[nr].size = (hvm_info->low_mem_pgend << PAGE_SHIFT) - e820[nr].addr; - e820[nr].type = E820_RAM; - nr++; - /* * Explicitly reserve space for special pages. * This space starts at RESERVED_MEMBASE an extends to cover various @@ -159,16 +153,56 @@ int build_e820_table(struct e820entry *e820, nr++; } - - if ( hvm_info->high_mem_pgend ) + /* + * Construct the remaining according memory_map. + * + * Note memory_map includes, + * + * #1. Low memory region + * + * Low RAM starts at least from 1M to make sure all standard regions + * of the PC memory map, like BIOS, VGA memory-mapped I/O and vgabios, + * have enough space. + * + * #2. RDM region if it exists + * + * #3. High memory region if it exists + */ + for ( i = 0; i < memory_map.nr_map; i++ ) { - e820[nr].addr = ((uint64_t)1 << 32); - e820[nr].size = - ((uint64_t)hvm_info->high_mem_pgend << PAGE_SHIFT) - e820[nr].addr; - e820[nr].type = E820_RAM; + e820[nr] = memory_map.map[i]; nr++; } + /* Low RAM goes here. Reserve space for special pages. */ + BUG_ON(low_mem_pgend < (2u << 20)); + /* + * We may need to adjust real lowmem end since we may + * populate RAM to get enough MMIO previously. + */ + for ( i = 0; i < memory_map.nr_map; i++ ) + { + uint64_t end = e820[i].addr + e820[i].size; + if ( e820[i].type == E820_RAM && + low_mem_pgend > e820[i].addr && low_mem_pgend < end ) + e820[i].size = low_mem_pgend - e820[i].addr; + } + + /* Finally we need to reorder all e820 entries. */ + for ( j = 0; j < nr-1; j++ ) + { + for ( i = j+1; i < nr; i++ ) + { + if ( e820[j].addr > e820[i].addr ) + { + struct e820entry tmp; + tmp = e820[j]; + e820[j] = e820[i]; + e820[i] = tmp; + } + } + } + return nr; } -- 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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