1 // Copyright 2016 The Fuchsia Authors
2 //
3 // Use of this source code is governed by a MIT-style
4 // license that can be found in the LICENSE file or at
5 // https://opensource.org/licenses/MIT
6
7 #include <assert.h>
8 #include <dev/udisplay.h>
9 #include <ktl/move.h>
10 #include <lib/crashlog.h>
11 #include <lib/debuglog.h>
12 #include <lib/gfxconsole.h>
13 #include <lib/io.h>
14 #include <platform.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <trace.h>
18 #include <vm/vm_aspace.h>
19 #include <vm/vm_object.h>
20
21 #define LOCAL_TRACE 0
22
23 constexpr uint kFramebufferArchMmuFlags = ARCH_MMU_FLAG_PERM_READ | ARCH_MMU_FLAG_PERM_WRITE;
24
25 static char crashlogbuf[4096u];
26
27 struct udisplay_info {
28 void* framebuffer_virt;
29 size_t framebuffer_size;
30 struct display_info info;
31 fbl::RefPtr<VmMapping> framebuffer_vmo_mapping;
32 };
33
34 static struct udisplay_info g_udisplay = {};
35
udisplay_init(void)36 zx_status_t udisplay_init(void) {
37 return ZX_OK;
38 }
39
dlog_bluescreen_halt(void)40 void dlog_bluescreen_halt(void) {
41 size_t len = crashlog_to_string(crashlogbuf, sizeof(crashlogbuf));
42 platform_stow_crashlog(crashlogbuf, len);
43 if (g_udisplay.framebuffer_virt == 0)
44 return;
45 }
46
udisplay_clear_framebuffer_vmo()47 void udisplay_clear_framebuffer_vmo() {
48 if (g_udisplay.framebuffer_vmo_mapping) {
49 g_udisplay.framebuffer_size = 0;
50 g_udisplay.framebuffer_virt = 0;
51 g_udisplay.framebuffer_vmo_mapping->Destroy();
52 g_udisplay.framebuffer_vmo_mapping = nullptr;
53 }
54 }
55
udisplay_set_framebuffer(fbl::RefPtr<VmObject> vmo)56 zx_status_t udisplay_set_framebuffer(fbl::RefPtr<VmObject> vmo) {
57 udisplay_clear_framebuffer_vmo();
58
59 const size_t size = vmo->size();
60 fbl::RefPtr<VmMapping> mapping;
61 zx_status_t status = VmAspace::kernel_aspace()->RootVmar()->CreateVmMapping(
62 0 /* ignored */, size, 0 /* align pow2 */, 0 /* vmar flags */,
63 ktl::move(vmo), 0, kFramebufferArchMmuFlags, "framebuffer_vmo", &mapping);
64 if (status != ZX_OK)
65 return status;
66
67 status = mapping->MapRange(0, size, true);
68 if (status != ZX_OK) {
69 mapping->Destroy();
70 return status;
71 }
72
73 g_udisplay.framebuffer_virt = reinterpret_cast<void*>(mapping->base());
74 g_udisplay.framebuffer_size = size;
75 g_udisplay.framebuffer_vmo_mapping = mapping;
76 return ZX_OK;
77 }
78
udisplay_set_display_info(struct display_info * display)79 zx_status_t udisplay_set_display_info(struct display_info* display) {
80 memcpy(&g_udisplay.info, display, sizeof(struct display_info));
81 return ZX_OK;
82 }
83
udisplay_bind_gfxconsole(void)84 zx_status_t udisplay_bind_gfxconsole(void) {
85 if (g_udisplay.framebuffer_virt == 0)
86 return ZX_ERR_NOT_FOUND;
87
88 // bind the display to the gfxconsole
89 g_udisplay.info.framebuffer = g_udisplay.framebuffer_virt;
90 g_udisplay.info.flags = DISPLAY_FLAG_NEEDS_CACHE_FLUSH | DISPLAY_FLAG_CRASH_FRAMEBUFFER;
91 gfxconsole_bind_display(&g_udisplay.info, nullptr);
92
93 return ZX_OK;
94 }
95