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#include <camellia/errno.h>
#include <camellia/fsutil.h>
#include <kernel/arch/amd64/driver/driver.h>
#include <kernel/arch/amd64/driver/util.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
#include <kernel/vfs/request.h>
#include <shared/mem.h>
#include <shared/printf.h>
static GfxInfo fb;
static char namebuf[64];
static size_t namelen;
enum {
H_ROOT,
H_FB,
};
static int handle(VfsReq *req) {
switch (req->type) {
case VFSOP_OPEN:
if (!req->input.kern) panic_invalid_state();
if (req->input.len == 0) {
return H_ROOT;
} else if (req->input.len == namelen && !memcmp(req->input.buf_kern, namebuf, namelen)) {
return H_FB;
} else {
return -1;
}
case VFSOP_READ:
if (req->id == H_ROOT) {
return req_readcopy(req, namebuf, namelen + 1);
} else {
return req_readcopy(req, fb.b, fb.size);
}
case VFSOP_WRITE:
if ((long __force)req->id != H_FB) {
return -1;
}
fs_normslice(&req->offset, &req->input.len, fb.size, false);
/* parial writes ignored */
pcpy_from(req->caller, fb.b + req->offset, req->input.buf, req->input.len);
return req->input.len;
case VFSOP_GETSIZE:
return fb.size;
default:
return -1;
}
}
static void accept(VfsReq *req) {
if (req->caller) {
vfsreq_finish_short(req, handle(req));
} else {
vfsreq_finish_short(req, -1);
}
}
void video_init(GfxInfo fb_) {
fb = fb_;
snprintf(namebuf, sizeof namebuf, "%ux%ux%u", fb.width, fb.height, fb.bpp);
namelen = strlen(namebuf);
vfs_root_register("/kdev/video/", accept);
}
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