This allows the PBL to fill a reserved memory map which a subsequent
commit will use modify the early MMU mapping.
Signed-off-by: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
---
include/pbl.h | 15 ++++++++++
pbl/fdt.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 95 insertions(+)
diff --git a/include/pbl.h b/include/pbl.h
index 194d5e7508..df0f41ac5b 100644
--- a/include/pbl.h
+++ b/include/pbl.h
@@ -34,4 +34,19 @@ ssize_t pbl_fat_load(struct pbl_bio *, const char *filename, void *dest, size_t
void fdt_find_mem(const void *fdt, unsigned long *membase, unsigned long *memsize);
+struct pbl_reserved_memory {
+ phys_addr_t base;
+ phys_addr_t size;
+ unsigned int flag;
+};
+
+#define MAX_RESERVED_REGIONS 8
+
+#define FDT_RES_MEM_FLAG_NOMAP BIT(0)
+
+void fdt_fill_reserve_mem(const void *fdt);
+
+struct pbl_reserved_memory* get_pbl_reserved_memory(void);
+int get_pbl_reserved_memory_num(void);
+
#endif /* __PBL_H__ */
diff --git a/pbl/fdt.c b/pbl/fdt.c
index b4a40a514b..f8e301843f 100644
--- a/pbl/fdt.c
+++ b/pbl/fdt.c
@@ -68,3 +68,83 @@ err:
pr_err("No memory, cannot continue\n");
while (1);
}
+
+struct pbl_reserved_memory reserved_mem[MAX_RESERVED_REGIONS];
+int reserved_mem_count;
+
+void fdt_fill_reserve_mem(const void *fdt)
+{
+ const __be32 *nap, *nsp, *reg;
+ uint32_t na, ns;
+ int node, size, i, parent;
+ const void * prop;
+ uint64_t memsize64, membase64;
+ bool nomap;
+
+ /* Make sure FDT blob is sane */
+ if (fdt_check_header(fdt) != 0) {
+ pr_err("Invalid device tree blob\n");
+ return;
+ }
+
+ parent = fdt_path_offset(fdt, "/reserved-memory");
+ if (parent < 0) {
+ pr_info("Cannot find reserved-memory node\n");
+ return;
+ }
+
+ nap = fdt_getprop(fdt, parent, "#address-cells", &size);
+ if (!nap || (size != 4)) {
+ pr_err("Cannot find #address-cells property");
+ return;
+ }
+ na = fdt32_to_cpu(*nap);
+
+ nsp = fdt_getprop(fdt, parent, "#size-cells", &size);
+ if (!nsp || (size != 4)) {
+ pr_err("Cannot find #size-cells property");
+ return;
+ }
+ ns = fdt32_to_cpu(*nap);
+
+ fdt_for_each_subnode(node, fdt, parent) {
+ nomap = true;
+ reg = fdt_getprop(fdt, node, "reg", &size);
+ if (size < (na + ns) * sizeof(u32)) {
+ pr_err("cannot get memory range\n");
+ return;
+ }
+
+ membase64 = 0;
+ for (i = 0; i < na; i++)
+ membase64 = (membase64 << 32) | fdt32_to_cpu(*reg++);
+
+ /* get the memsize and truncate it to under 4G on 32 bit machines */
+ memsize64 = 0;
+ for (i = 0; i < ns; i++)
+ memsize64 = (memsize64 << 32) | fdt32_to_cpu(*reg++);
+
+ prop = fdt_getprop(fdt, node, "nomap", NULL);
+ if (!prop)
+ nomap = false;
+
+ reserved_mem[reserved_mem_count].base = membase64;
+ reserved_mem[reserved_mem_count].size = memsize64;
+ if (nomap)
+ reserved_mem[reserved_mem_count].flag |= FDT_RES_MEM_FLAG_NOMAP;
+ reserved_mem_count++;
+ }
+
+ if ((node < 0) && (node != -FDT_ERR_NOTFOUND)) {
+ pr_err("Error while parsing reserved-memory nodes: %d\n", node);
+ return;
+ }
+}
+
+struct pbl_reserved_memory* get_pbl_reserved_memory(void) {
+ return (struct pbl_reserved_memory*)&reserved_mem;
+}
+
+int get_pbl_reserved_memory_num(void) {
+ return reserved_mem_count;
+}
--
2.31.1
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