[U-Boot] [PATCH v1 08/12] efi_loader: console support for color attributes

Rob Clark
2017-09-10T13:22:29Z

Shell.efi uses this, and supporting color attributes makes things look
nicer. Map the EFI fg/bg color attributes to ANSI escape sequences.
Not all colors have a perfect match, but spec just says "Devices
supporting a different number of text colors are required to emulate the
above colors to the best of the device’s capabilities".

Signed-off-by: Rob Clark <robdclark@gmail.com>
---
include/efi_api.h | 29 +++++++++++++++++++++++++++++
lib/efi_loader/efi_console.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 59 insertions(+)

diff --git a/include/efi_api.h b/include/efi_api.h
index 87c8ffe68e..3cc1dbac2e 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -426,6 +426,35 @@ struct simple_text_output_mode {
EFI_GUID(0x387477c2, 0x69c7, 0x11d2, \
0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b)

+#define EFI_BLACK 0x00
+#define EFI_BLUE 0x01
+#define EFI_GREEN 0x02
+#define EFI_CYAN 0x03
+#define EFI_RED 0x04
+#define EFI_MAGENTA 0x05
+#define EFI_BROWN 0x06
+#define EFI_LIGHTGRAY 0x07
+#define EFI_BRIGHT 0x08
+#define EFI_DARKGRAY 0x08
+#define EFI_LIGHTBLUE 0x09
+#define EFI_LIGHTGREEN 0x0a
+#define EFI_LIGHTCYAN 0x0b
+#define EFI_LIGHTRED 0x0c
+#define EFI_LIGHTMAGENTA 0x0d
+#define EFI_YELLOW 0x0e
+#define EFI_WHITE 0x0f
+#define EFI_BACKGROUND_BLACK 0x00
+#define EFI_BACKGROUND_BLUE 0x10
+#define EFI_BACKGROUND_GREEN 0x20
+#define EFI_BACKGROUND_CYAN 0x30
+#define EFI_BACKGROUND_RED 0x40
+#define EFI_BACKGROUND_MAGENTA 0x50
+#define EFI_BACKGROUND_BROWN 0x60
+#define EFI_BACKGROUND_LIGHTGRAY 0x70
+
+#define EFI_ATTR_FG(attr) ((attr) & 0x0f)
+#define EFI_ATTR_BG(attr) (((attr) >> 4) & 0x7)
+
struct efi_simple_text_output_protocol {
void *reset;
efi_status_t (EFIAPI *output_string)(
diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index 2e13fdc096..fcd65ca488 100644
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -316,12 +316,42 @@ static efi_status_t EFIAPI efi_cout_set_mode(
return EFI_EXIT(EFI_SUCCESS);
}

+static const struct {
+ unsigned fg;
+ unsigned bg;
+} color[] = {
+ { 30, 40 }, /* 0: black */
+ { 34, 44 }, /* 1: blue */
+ { 32, 42 }, /* 2: green */
+ { 36, 46 }, /* 3: cyan */
+ { 31, 41 }, /* 4: red */
+ { 35, 45 }, /* 5: magenta */
+ { 30, 40 }, /* 6: brown, map to black */
+ { 37, 47 }, /* 7: light grey, map to white */
+ { 37, 47 }, /* 8: bright, map to white */
+ { 34, 44 }, /* 9: light blue, map to blue */
+ { 32, 42 }, /* A: light green, map to green */
+ { 36, 46 }, /* B: light cyan, map to cyan */
+ { 31, 41 }, /* C: light red, map to red */
+ { 35, 45 }, /* D: light magenta, map to magenta */
+ { 33, 43 }, /* E: yellow */
+ { 37, 47 }, /* F: white */
+};
+
static efi_status_t EFIAPI efi_cout_set_attribute(
struct efi_simple_text_output_protocol *this,
unsigned long attribute)
{
+ unsigned fg = EFI_ATTR_FG(attribute);
+ unsigned bg = EFI_ATTR_BG(attribute);
+
EFI_ENTRY("%p, %lx", this, attribute);

+ if (attribute)
+ printf(ESC"[%u;%um", color[fg].fg, color[bg].bg);
+ else
+ printf(ESC"[37;40m");
+
/* Just ignore attributes (colors) for now */
return EFI_EXIT(EFI_UNSUPPORTED);
}
--
2.13.5