https://git.reactos.org/?p=reactos.git;a=commitdiff;h=d0f6d2cf6eb781b188103a...
commit d0f6d2cf6eb781b188103ae5157f67fa6040a493 Author: Timo Kreuzer timo.kreuzer@reactos.org AuthorDate: Sun Jun 13 11:26:06 2021 +0200 Commit: Timo Kreuzer timo.kreuzer@reactos.org CommitDate: Sat Jun 19 12:01:24 2021 +0200
[FREELDR/x64] Allow using memory above 4GB on x64
This splits MM_MAX_PAGE into the maximum addressable PFN (which is 2^20-1 on x86, 2^26-1 on x86PAE and 2^36-1 on x64) and the maximum mapped/accessible virtual memory MM_MAX_PAGE_LOADER (which is 4 GB on x86, since paging is disabled, but only 1 GB on x64, since only that much is identity-mapped). --- boot/freeldr/freeldr/include/mm.h | 10 ++++++++-- boot/freeldr/freeldr/lib/mm/meminit.c | 6 +++--- 2 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/boot/freeldr/freeldr/include/mm.h b/boot/freeldr/freeldr/include/mm.h index dd1bb195633..a3f34a55f78 100644 --- a/boot/freeldr/freeldr/include/mm.h +++ b/boot/freeldr/freeldr/include/mm.h @@ -51,7 +51,12 @@ typedef struct _FREELDR_MEMORY_DESCRIPTOR #define MM_PAGE_SIZE 4096 #define MM_PAGE_MASK 0xFFF #define MM_PAGE_SHIFT 12 -#define MM_MAX_PAGE 0xFFFFF +#if defined(_X86PAE_) +#define MM_MAX_PAGE 0x3FFFFFF /* 26 bits for the PFN */ +#else +#define MM_MAX_PAGE 0xFFFFF /* 20 bits for the PFN */ +#endif +#define MM_MAX_PAGE_LOADER 0xFFFFF /* 4 GB flat address range */
#define MM_SIZE_TO_PAGES(a) \ ( ((a) >> MM_PAGE_SHIFT) + ((a) & MM_PAGE_MASK ? 1 : 0) ) @@ -63,7 +68,8 @@ typedef struct _FREELDR_MEMORY_DESCRIPTOR #define MM_PAGE_SIZE 4096 #define MM_PAGE_MASK 0xFFF #define MM_PAGE_SHIFT 12 -#define MM_MAX_PAGE 0x3FFFF /* freeldr only maps 1 GB */ +#define MM_MAX_PAGE 0xFFFFFFFFF /* 36 bits for the PFN */ +#define MM_MAX_PAGE_LOADER 0x3FFFF /* on x64 freeldr only maps 1 GB */
#define MM_SIZE_TO_PAGES(a) \ ( ((a) >> MM_PAGE_SHIFT) + ((a) & MM_PAGE_MASK ? 1 : 0) ) diff --git a/boot/freeldr/freeldr/lib/mm/meminit.c b/boot/freeldr/freeldr/lib/mm/meminit.c index 8276cb8ca57..37a705a0c68 100644 --- a/boot/freeldr/freeldr/lib/mm/meminit.c +++ b/boot/freeldr/freeldr/lib/mm/meminit.c @@ -1,7 +1,7 @@ /* * FreeLoader * Copyright (C) 2006-2008 Aleksey Bragin aleksey@reactos.org - * Copyright (C) 2006-2009 Herv� Poussineau hpoussin@reactos.org + * Copyright (C) 2006-2009 Hervé Poussineau hpoussin@reactos.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -438,7 +438,7 @@ PVOID MmFindLocationForPageLookupTable(PFN_NUMBER TotalPageCount) if (MemoryDescriptor->BasePage < CandidateBasePage) continue;
// Continue, if the address is too high - if (MemoryDescriptor->BasePage + RequiredPages >= MM_MAX_PAGE) continue; + if (MemoryDescriptor->BasePage + RequiredPages >= MM_MAX_PAGE_LOADER) continue;
// Memory block is more suitable than the previous one CandidateBasePage = MemoryDescriptor->BasePage; @@ -447,7 +447,7 @@ PVOID MmFindLocationForPageLookupTable(PFN_NUMBER TotalPageCount)
// Calculate the end address for the lookup table PageLookupTableEndPage = min(CandidateBasePage + CandidatePageCount, - MM_MAX_PAGE); + MM_MAX_PAGE_LOADER);
// Calculate the virtual address PageLookupTableMemAddress = (PVOID)((PageLookupTableEndPage * PAGE_SIZE)
-
Timo Kreuzer