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efi_loader: clear screen should move cursor to home

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On a VT100 terminal <ESC>[2J should be enough to both clear the whole
screen and set the cursor to position (1, 1). But the Linux console does
not behave like this. So send an extra <ESC>[H. For reference see the
console_codes(4) man page.

Add a function description.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-12-22 07:15:55 +00:00
parent 3510280960
commit b0ad9b5b2a
1 changed files with 15 additions and 1 deletions
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16
lib/efi_loader/efi_console.c
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@ -360,12 +360,26 @@ static efi_status_t EFIAPI efi_cout_set_attribute(
return EFI_EXIT(EFI_SUCCESS);
}
/**
* efi_cout_clear_screen() - clear screen
*
* This function implements the ClearScreen service of the
* EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL. See the Unified Extensible Firmware
* Interface (UEFI) specification for details.
*
* @this: pointer to the protocol instance
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_clear_screen(
struct efi_simple_text_output_protocol *this)
{
EFI_ENTRY("%p", this);
printf(ESC"[2J");
/*
* The Linux console wants both a clear and a home command. The video
* uclass does not support <ESC>[H without coordinates, yet.
*/
printf(ESC "[2J" ESC "[1;1H");
efi_con_mode.cursor_column = 0;
efi_con_mode.cursor_row = 0;