kernel/linux.git/drivers/video/console/vgacon.c, branch linux-4.16.y

vgacon: Set VGA struct resource types

2017-12-19T05:07:43+00:00

Set the resource type when we reserve VGA-related I/O port resources. The resource code doesn't actually look at the type, so it inserts resources without a type in the tree correctly even without this change. But if we ever print a resource without a type, it looks like this: vga+ [??? 0x000003c0-0x000003df flags 0x0] Setting the type means it will be printed correctly as: vga+ [io 0x000003c0-0x000003df] Signed-off-by: Bjorn Helgaas

vgacon: Prevent faulty bootparams.screeninfo from causing harm

2017-09-04T14:00:50+00:00

If a zero for the number of colums or rows manages to slip through, gotoxy() will underflow vc->vc_pos, causing the next action on the referenced memory to end with a page fault. Make the check in vgacon_startup() more pessimistic to prevent that. Signed-off-by: Jan H. Schönherr Cc: Greg Kroah-Hartman Cc: Jiri Slaby Signed-off-by: Bartlomiej Zolnierkiewicz

console: Make persistent scrollback a boot parameter

2017-01-25T10:54:02+00:00

The impact of the persistent scrollback feature on the code size is rather small, so the config option is removed. The feature stays disabled by default and can be enabled by using the boot command line parameter 'vgacon.scrollback_persistent=1' or by setting VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT=y. Signed-off-by: Manuel Schölling Suggested-by: Bartlomiej Zolnierkiewicz Signed-off-by: Greg Kroah-Hartman

console: Add persistent scrollback buffers for all VGA consoles

2017-01-25T10:54:02+00:00

Add a scrollback buffers for each VGA console. The benefit is that the scrollback history is not flushed when switching between consoles but is persistent. The buffers are allocated on demand when a new console is opened. This breaks tools like clear_console that rely on flushing the scrollback history by switching back and forth between consoles which is why this feature is disabled by default. Use the escape sequence \e[3J instead for flushing the buffer. Signed-off-by: Manuel Schölling Reviewed-by: Andrey Utkin Tested-by: Andrey Utkin Tested-by: Adam Borowski Signed-off-by: Greg Kroah-Hartman

console: Add callback to flush scrollback buffer to consw struct

2017-01-25T10:54:02+00:00

This new callback is in preparation for persistent scrollback buffer support for VGA consoles. With a single scrollback buffer for all consoles, we could flush the buffer just by invocating consw->con_switch(). But when each VGA console has its own scrollback buffer, we need a new callback to tell the video console driver which buffer to flush. Signed-off-by: Manuel Schölling Reviewed-by: Andrey Utkin Tested-by: Andrey Utkin Tested-by: Adam Borowski Signed-off-by: Greg Kroah-Hartman

console: Move scrollback data into its own struct

2017-01-25T10:54:02+00:00

This refactoring is in preparation for persistent scrollback support for VGA console. Signed-off-by: Manuel Schölling Reviewed-by: Andrey Utkin Tested-by: Andrey Utkin Tested-by: Adam Borowski Signed-off-by: Greg Kroah-Hartman

vgacon: remove prehistoric macros

2016-10-27T14:37:44+00:00

These macros: * CAN_LOAD_EGA_FONTS * CAN_LOAD_PALETTE * TRIDENT_GLITCH * VGA_CAN_DO_64KB * SLOW_VGA are either always set or always unset. They come from the linux 2.1 times. And given nobody switched them to some configurable options, I assume nobody actually uses them. So remove the macros and leave in place appropriate branches of the conditional code. Signed-off-by: Jiri Slaby Cc: Tomi Valkeinen Cc: Cc: Signed-off-by: Greg Kroah-Hartman

vgacon: switch boolean variables to bool

2016-10-27T14:37:44+00:00

These variables: * vga_can_do_color * vgacon_text_mode_force * vga_font_is_default * vga_hardscroll_enabled * vga_hardscroll_user_enable * vga_init_done * vga_is_gfx * vga_palette_blanked * vga_512_chars are used exclusively as a boolean value, so make them really a bool. Remove also useless "? true : false". __read_mostly annotations removed too as they obfuscate the code and I doubt they improve anything measurable given the variables are used from .con_scroll, .con_startup and such. Signed-off-by: Jiri Slaby Cc: Tomi Valkeinen Cc: Signed-off-by: Greg Kroah-Hartman

tty: vgacon+sisusb, move scrolldelta to a common helper

2016-10-27T14:37:44+00:00

The code is mirrorred in scrolldelta implementations of both vgacon and sisusb. Let's move the code to a separate helper where we will perform a common cleanup and further changes. While we are moving the code, make it linear and save one indentation level. This is done by returning from the "!lines" then-branch immediatelly. This allows flushing the else-branch 1 level to the left, obviously. Few more new lines and comments were added too. And do not forget to export the helper function given sisusb can be built as module. Signed-off-by: Jiri Slaby Cc: Thomas Winischhofer Cc: Tomi Valkeinen Cc: Cc: Signed-off-by: Greg Kroah-Hartman

tty: vt, cleanup and document con_scroll

2016-10-27T14:37:43+00:00

Scrolling helpers scrup and scrdown both accept 'top' and 'bottom' as unsigned int. Number of lines 'nr' is accepted as int, but all callers pass down unsigned too. So change the type of 'nr' to unsigned too. Now, promote unsigned int from the helpers up to the con_scroll hook which actually accepted all those as signed int. Next, the 'dir' parameter can have only two values and we define constants for that: SM_UP and SM_DOWN. Switch them to enum and do proper type checking on 'dir' too. Finally, document the behaviour of the hook. Signed-off-by: Jiri Slaby Cc: Thomas Winischhofer Cc: Tomi Valkeinen Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: Cc: Cc: Signed-off-by: Greg Kroah-Hartman