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[GRUB PATCH RFC 06/18] mmap: Add grub_mmap_get_lowest() and grub_mmap_ge
From: |
Daniel Kiper |
Subject: |
[GRUB PATCH RFC 06/18] mmap: Add grub_mmap_get_lowest() and grub_mmap_get_highest() |
Date: |
Tue, 5 May 2020 01:21:20 +0200 |
The functions calculate lowest and highest available RAM
addresses respectively.
Both functions are needed to calculate PMR boundaries for
Intel TXT secure launcher introduced by subsequent patches.
Signed-off-by: Daniel Kiper <address@hidden>
---
grub-core/mmap/mmap.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/grub/memory.h | 3 +++
2 files changed, 67 insertions(+)
diff --git a/grub-core/mmap/mmap.c b/grub-core/mmap/mmap.c
index b569cb23b..cf4b69f56 100644
--- a/grub-core/mmap/mmap.c
+++ b/grub-core/mmap/mmap.c
@@ -340,6 +340,70 @@ grub_mmap_unregister (int handle)
#endif /* ! GRUB_MMAP_REGISTER_BY_FIRMWARE */
+typedef struct
+{
+ grub_uint64_t addr;
+ grub_uint64_t limit;
+} addr_limit_t;
+
+/* Helper for grub_mmap_get_lowest(). */
+static int
+lowest_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
+ void *data)
+{
+ addr_limit_t *al = data;
+
+ if (type != GRUB_MEMORY_AVAILABLE)
+ return 0;
+
+ if (addr >= al->limit)
+ al->addr = grub_min (al->addr, addr);
+
+ if ((addr < al->limit) && ((addr + size) > al->limit))
+ al->addr = al->limit;
+
+ return 0;
+}
+
+grub_uint64_t
+grub_mmap_get_lowest (grub_uint64_t limit)
+{
+ addr_limit_t al = {~0, limit};
+
+ grub_mmap_iterate (lowest_hook, &al);
+
+ return al.addr;
+}
+
+/* Helper for grub_mmap_get_highest(). */
+static int
+highest_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
+ void *data)
+{
+ addr_limit_t *al = data;
+
+ if (type != GRUB_MEMORY_AVAILABLE)
+ return 0;
+
+ if ((addr + size) < al->limit)
+ al->addr = grub_max (al->addr, addr + size);
+
+ if ((addr < al->limit) && ((addr + size) >= al->limit))
+ al->addr = al->limit;
+
+ return 0;
+}
+
+grub_uint64_t
+grub_mmap_get_highest (grub_uint64_t limit)
+{
+ addr_limit_t al = {0, limit};
+
+ grub_mmap_iterate (highest_hook, &al);
+
+ return al.addr;
+}
+
#define CHUNK_SIZE 0x400
struct badram_entry {
diff --git a/include/grub/memory.h b/include/grub/memory.h
index 6da114a1b..8f22f7525 100644
--- a/include/grub/memory.h
+++ b/include/grub/memory.h
@@ -69,6 +69,9 @@ void *grub_mmap_malign_and_register (grub_uint64_t align,
grub_uint64_t size,
void grub_mmap_free_and_unregister (int handle);
+extern grub_uint64_t grub_mmap_get_lowest (grub_uint64_t limit);
+extern grub_uint64_t grub_mmap_get_highest (grub_uint64_t limit);
+
#ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE
struct grub_mmap_region
--
2.11.0
- [GRUB PATCH RFC 00/18] i386: Intel TXT secure launcher, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 03/18] i386/msr: Extract and improve MSR support detection code, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 05/18] i386/memory: Rename PAGE_SIZE to GRUB_PAGE_SIZE and make it global, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 04/18] i386/memory: Rename PAGE_SHIFT to GRUB_PAGE_SHIFT, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 01/18] i386/msr: Merge rdmsr.h and wrmsr.h into msr.h, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 06/18] mmap: Add grub_mmap_get_lowest() and grub_mmap_get_highest(),
Daniel Kiper <=
- [GRUB PATCH RFC 09/18] efi: Make shim_lock GUID and protocol type public, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 10/18] efi: Return grub_efi_status_t from grub_efi_get_variable(), Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 11/18] efi: Add a function to read EFI variables with attributes, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 13/18] i386/slaunch: Add basic platform support for secure launch, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 14/18] i386/txt: Add Intel TXT definitions header file, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 17/18] i386/txt: Add Intel TXT verification routines, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 16/18] i386/txt: Add Intel TXT ACM module support, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 18/18] i386/slaunch: Add secure launch framework and commands, Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 02/18] i386/msr: Rename grub_msr_read() and grub_msr_write(), Daniel Kiper, 2020/05/04
- [GRUB PATCH RFC 07/18] i386/tpm: Rename tpm module to tpm_verifier, Daniel Kiper, 2020/05/04