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kboot: Add dt_reserve_asc_firmware

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The new function parses ADT's segment-ranges and builds up nodes in
/reserved-memory representing the appropriate physical and device
address spans. This is to describe the memory placement of ASC firmware.

Signed-off-by: Martin Povišer <povik@cutebit.org>
This commit is contained in:
Martin Povišer 2022-11-26 22:57:32 +01:00 committed by Hector Martin
parent 925fe72b0b
commit 8be10f5fa9
1 changed files with 55 additions and 0 deletions
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55
src/kboot.c
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@ -1506,6 +1506,61 @@ static int dt_vram_reserved_region(const char *dcp_alias, const char *disp_alias
disp_reserved_regions_vram, &region, 1);
}
static int dt_reserve_asc_firmware(const char *adt_path, const char *fdt_path)
{
int ret = 0;
int fdt_node = fdt_path_offset(dt, fdt_path);
if (fdt_node < 0) {
printf("DT: '%s' not found\n", fdt_path);
return 0;
}
int node = adt_path_offset(adt, adt_path);
if (node < 0)
bail("ADT: '%s' not found\n", adt_path);
uint32_t dev_phandle = fdt_get_phandle(dt, fdt_node);
if (!dev_phandle) {
ret = fdt_generate_phandle(dt, &dev_phandle);
if (!ret)
ret = fdt_setprop_u32(dt, fdt_node, "phandle", dev_phandle);
if (ret != 0)
bail("DT: couldn't set '%s.phandle' property: %d\n", fdt_path, ret);
}
const uint64_t *segments;
u32 segments_len;
segments = adt_getprop(adt, node, "segment-ranges", &segments_len);
unsigned int num_maps = segments_len / 32;
for (unsigned i = 0; i < num_maps; i++) {
u64 paddr = segments[0];
u64 iova = segments[2];
u32 size = segments[3];
segments += 4;
char node_name[64];
snprintf(node_name, sizeof(node_name), "asc-firmware@%lx", paddr);
int mem_node = dt_get_or_add_reserved_mem(node_name, "apple,asc-mem", paddr, size);
if (mem_node < 0)
return ret;
uint32_t mem_phandle = fdt_get_phandle(dt, mem_node);
ret = dt_device_set_reserved_mem(mem_node, node_name, dev_phandle, iova, size);
if (ret < 0)
return ret;
ret = dt_device_add_mem_region(fdt_path, mem_phandle, NULL);
if (ret < 0)
return ret;
}
return 0;
}
static struct disp_mapping disp_reserved_regions_t8103[] = {
{"region-id-50", "dcp_data", true, false, false},
{"region-id-57", "region57", true, false, false},