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Add two fake properties ("fdtbootcpu" and "fdtmemreserv") to the device

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tree's /chosen node to provide out-of-band header fields of the FDT. This
emulation is not perfect without corresponding changes to ofw_fdt_nextprop(),
but is enough to enable lookup by memory-map-parsing code.

MFC after:	1 week
This commit is contained in:
Nathan Whitehorn 2015-01-16 18:47:20 +00:00
parent 622d02fb21
commit c884d31122
1 changed files with 20 additions and 0 deletions
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20
sys/dev/ofw/ofw_fdt.c
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@ -231,6 +231,13 @@ ofw_fdt_getproplen(ofw_t ofw, phandle_t package, const char *propname)
return (len + 1); return (len + 1);
} }
if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
if (strcmp(propname, "fdtbootcpu") == 0)
return (sizeof(cell_t));
if (strcmp(propname, "fdtmemreserv") == 0)
return (sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp));
}
return (len); return (len);
} }
@ -242,6 +249,7 @@ ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
const void *prop; const void *prop;
const char *name; const char *name;
int len, offset; int len, offset;
uint32_t cpuid;
offset = fdt_phandle_offset(package); offset = fdt_phandle_offset(package);
if (offset < 0) if (offset < 0)
@ -258,6 +266,18 @@ ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
return (len + 1); return (len + 1);
} }
if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
if (strcmp(propname, "fdtbootcpu") == 0) {
cpuid = cpu_to_fdt32(fdt_boot_cpuid_phys(fdtp));
len = sizeof(cpuid);
prop = &cpuid;
}
if (strcmp(propname, "fdtmemreserv") == 0) {
prop = (char *)fdtp + fdt_off_mem_rsvmap(fdtp);
len = sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp);
}
}
if (prop == NULL) if (prop == NULL)
return (-1); return (-1);