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fdt: expose FDT data to userland

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Change-Id: I05c935735f54874630c641bf8ab7cbd378b71ba0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6598
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Niels Sascha Reedijk <niels.reedijk@gmail.com>
This commit is contained in:
X512 2023-06-13 06:15:59 +09:00 committed by waddlesplash
parent bb2b9b02aa
commit 2075595c78
1 changed files with 58 additions and 0 deletions
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58
src/add-ons/kernel/bus_managers/fdt/fdt_module.cpp
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@ -247,6 +247,11 @@ fdt_bus_register_child_devices(void* cookie)
fdt_bus* bus = (fdt_bus*)cookie;
status_t res = gDeviceManager->publish_device(bus->node, "bus/fdt/blob",
"bus_managers/fdt/device/v1");
if (res < B_OK)
return res;
int node = -1, depth = -1;
node = fdt_next_node(gFDT, node, &depth);
fdt_traverse(bus, node, depth, bus->node);
@ -691,6 +696,33 @@ fdt_device_lookup_interrupt_map(struct fdt_interrupt_map* interruptMap, uint32 c
}
//#pragma mark devfs node
static status_t
fdt_devfs_node_read(void *cookie, off_t pos, void *buffer, size_t *_length)
{
if (pos < 0)
return B_BAD_VALUE;
size_t size = fdt_totalsize(gFDT);
if ((uint64)pos >= size) {
*_length = 0;
return B_OK;
}
size_t readSize = *_length;
if (pos + readSize > size)
readSize = size - pos;
status_t res = user_memcpy(buffer, (uint8*)gFDT + pos, readSize);
if (res < B_OK)
return res;
*_length = readSize;
return B_OK;
}
//#pragma mark -
fdt_bus_module_info gBusModule = {
@ -739,9 +771,35 @@ fdt_device_module_info gDeviceModule = {
};
device_module_info gDevfsNodeModule = {
.info = {
.name = "bus_managers/fdt/device/v1"
},
.init_device = [](void *driverCookie, void **_deviceCookie) {
*_deviceCookie = NULL;
return B_OK;
},
.uninit_device = [](void *deviceCookie) {},
.open = [](void *deviceCookie, const char *path, int openMode, void **_cookie) {
return B_OK;
},
.close = [](void *cookie) {
return B_OK;
},
.free = [](void *cookie) {
return B_OK;
},
.read = fdt_devfs_node_read,
.control = [](void *cookie, uint32 op, void *buffer, size_t length) {
return B_DEV_INVALID_IOCTL;
},
};
module_info* modules[] = {
(module_info*)&gBusModule,
(module_info*)&gDeviceModule,
(module_info*)&gDevfsNodeModule,
NULL
};