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x86: map all RAM if ACPI

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ACPI tables can lurk anywhere. Map all memory so they can be
read.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2021-01-23 14:14:23 -08:00 • committed by Anas Nashif
commit 77861037d9
4 changed files with 28 additions and 4 deletions
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1
arch/Kconfig
View file

@ -62,7 +62,6 @@ config X86
select ARCH_HAS_TIMING_FUNCTIONS
select ARCH_HAS_THREAD_LOCAL_STORAGE
select ARCH_HAS_DEMAND_PAGING
select ARCH_MAPS_ALL_RAM
help
x86 architecture

1
arch/x86/Kconfig
View file

@ -95,6 +95,7 @@ endchoice
config ACPI
bool "ACPI (Advanced Configuration and Power Interface) support"
select ARCH_MAPS_ALL_RAM
help
Allow retrieval of platform configuration at runtime.

14
arch/x86/gen_mmu.py
View file

@ -457,10 +457,15 @@ def main():
debug("building %s" % pclass.__name__)
vm_base = syms["CONFIG_KERNEL_VM_BASE"]
vm_size = syms["CONFIG_KERNEL_VM_SIZE"]
# Work around #31562
vm_size = syms["CONFIG_KERNEL_VM_SIZE"] & 0xFFFFFFFF
image_base = syms["z_mapped_start"]
image_size = syms["z_mapped_size"]
if isdef("CONFIG_ARCH_MAPS_ALL_RAM"):
image_base = syms["CONFIG_SRAM_BASE_ADDRESS"]
image_size = syms["CONFIG_SRAM_SIZE"] * 1024
else:
image_base = syms["z_mapped_start"]
image_size = syms["z_mapped_size"]
ptables_phys = syms["z_x86_pagetables_start"]
debug("Address space: 0x%x - 0x%x size %x" %
@ -471,6 +476,9 @@ def main():
is_perm_regions = isdef("CONFIG_SRAM_REGION_PERMISSIONS")
if image_size >= vm_size:
error("VM size is too small (have 0x%x need more than 0x%x)" % (vm_size, image_size))
if is_perm_regions:
# Don't allow execution by default for any pages. We'll adjust this
# in later calls to pt.set_region_perms()

16
tests/arch/x86/pagetables/src/main.c
View file

@ -159,6 +159,22 @@ void test_ram_perms(void)
PRI_ENTRY, flags, pos, expected);
}
#endif /* CONFIG_X86_64 */
#ifdef CONFIG_ARCH_MAPS_ALL_RAM
/* All RAM page frame entries aside from 0x0 must have a mapping.
* We currently identity-map on x86, no conversion necessary other than a cast
*/
for (pos = (uint8_t *)Z_PHYS_RAM_START; pos < (uint8_t *)Z_PHYS_RAM_END;
pos += CONFIG_MMU_PAGE_SIZE) {
if (pos == NULL) {
continue;
}
entry = get_entry(&flags, pos);
zassert_true((flags & MMU_P) != 0,
"address %p isn't mapped", pos);
}
#endif
}
/**