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patterns/fdt: Fix flattened device tree parsing (#140)

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* Fix flattened device tree parsing

Fix parsing to support multiple FDTs in a file and
non-zero base addresses.

* Fix string parsing

Parent offset wasn't being taken into account
when looking for prop names.
This commit is contained in:
vikke1234
2023-07-13 15:38:52 +03:00
committed by GitHub
parent ab43516517
commit 50f93d14ff
1 changed files with 7 additions and 6 deletions
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13
patterns/fdt.pat
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@@ -2,6 +2,7 @@
#include <std/sys.pat>
#include <std/io.pat>
#include <std/mem.pat>
#include <type/magic.pat>
#include <type/size.pat>
@@ -26,7 +27,7 @@ struct AlignTo<auto Alignment> {
struct FDTReserveEntry {
u64 address;
type::Size<u64> size;
if (address == 0x00 && size == 0x00)
break;
};
@@ -51,7 +52,7 @@ struct FDTStructureBlock {
u32 nameoff;
char value[len];
AlignTo<4>;
char name[] @ parent.header.off_dt_strings + nameoff;
char name[] @ address(parent) + parent.header.off_dt_strings + nameoff;
} else if (token == FDTToken::FDT_NOP || token == FDTToken::FDT_END_NODE) {
// Nothing to do
} else {
@@ -62,9 +63,9 @@ struct FDTStructureBlock {
struct FDT {
FDTHeader header;
std::assert(header.version == 17, "Unsupported format version");
FDTStructureBlock structureBlocks[while(true)] @ header.off_dt_struct;
FDTReserveEntry reserveEntries[while(true)] @ header.off_mem_rsvmap;
FDTStructureBlock structureBlocks[while(true)] @ addressof(this) + header.off_dt_struct;
FDTReserveEntry reserveEntries[while(true)] @ addressof(this) + header.off_mem_rsvmap;
};
FDT fdt @ 0x00;
std::mem::MagicSearch<"\xD0\x0D\xFE\xED", FDT> fdt @ std::mem::base_address();