xen: allow enable use of VGA console on dom0 (c2419b4a) · Commits · 戴 / test

arch/x86/xen/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -18,5 +18,5 @@ obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
		obj-$(CONFIG_SMP) += smp.o
		obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
		obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o

		obj-$(CONFIG_XEN_DOM0) += vga.o
		obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o

arch/x86/xen/enlighten.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -1241,6 +1241,14 @@ asmlinkage void __init xen_start_kernel(void)
		if (pci_xen)
		x86_init.pci.arch_init = pci_xen_init;
		} else {
		const struct dom0_vga_console_info *info =
		(void )((char )xen_start_info +
		xen_start_info->console.dom0.info_off);

		xen_init_vga(info, xen_start_info->console.dom0.info_size);
		xen_start_info->console.domU.mfn = 0;
		xen_start_info->console.domU.evtchn = 0;

		/* Make sure ACS will be enabled */
		pci_request_acs();
		}

arch/x86/xen/vga.c

0 → 100644

+67 −0

Original line number	Diff line number	Diff line
		#include <linux/screen_info.h>
		#include <linux/init.h>

		#include <asm/bootparam.h>
		#include <asm/setup.h>

		#include <xen/interface/xen.h>

		#include "xen-ops.h"

		void __init xen_init_vga(const struct dom0_vga_console_info *info, size_t size)
		{
		struct screen_info *screen_info = &boot_params.screen_info;

		/* This is drawn from a dump from vgacon:startup in
		* standard Linux. */
		screen_info->orig_video_mode = 3;
		screen_info->orig_video_isVGA = 1;
		screen_info->orig_video_lines = 25;
		screen_info->orig_video_cols = 80;
		screen_info->orig_video_ega_bx = 3;
		screen_info->orig_video_points = 16;
		screen_info->orig_y = screen_info->orig_video_lines - 1;

		switch (info->video_type) {
		case XEN_VGATYPE_TEXT_MODE_3:
		if (size < offsetof(struct dom0_vga_console_info, u.text_mode_3)
		+ sizeof(info->u.text_mode_3))
		break;
		screen_info->orig_video_lines = info->u.text_mode_3.rows;
		screen_info->orig_video_cols = info->u.text_mode_3.columns;
		screen_info->orig_x = info->u.text_mode_3.cursor_x;
		screen_info->orig_y = info->u.text_mode_3.cursor_y;
		screen_info->orig_video_points =
		info->u.text_mode_3.font_height;
		break;

		case XEN_VGATYPE_VESA_LFB:
		if (size < offsetof(struct dom0_vga_console_info,
		u.vesa_lfb.gbl_caps))
		break;
		screen_info->orig_video_isVGA = VIDEO_TYPE_VLFB;
		screen_info->lfb_width = info->u.vesa_lfb.width;
		screen_info->lfb_height = info->u.vesa_lfb.height;
		screen_info->lfb_depth = info->u.vesa_lfb.bits_per_pixel;
		screen_info->lfb_base = info->u.vesa_lfb.lfb_base;
		screen_info->lfb_size = info->u.vesa_lfb.lfb_size;
		screen_info->lfb_linelength = info->u.vesa_lfb.bytes_per_line;
		screen_info->red_size = info->u.vesa_lfb.red_size;
		screen_info->red_pos = info->u.vesa_lfb.red_pos;
		screen_info->green_size = info->u.vesa_lfb.green_size;
		screen_info->green_pos = info->u.vesa_lfb.green_pos;
		screen_info->blue_size = info->u.vesa_lfb.blue_size;
		screen_info->blue_pos = info->u.vesa_lfb.blue_pos;
		screen_info->rsvd_size = info->u.vesa_lfb.rsvd_size;
		screen_info->rsvd_pos = info->u.vesa_lfb.rsvd_pos;
		if (size >= offsetof(struct dom0_vga_console_info,
		u.vesa_lfb.gbl_caps)
		+ sizeof(info->u.vesa_lfb.gbl_caps))
		screen_info->capabilities = info->u.vesa_lfb.gbl_caps;
		if (size >= offsetof(struct dom0_vga_console_info,
		u.vesa_lfb.mode_attrs)
		+ sizeof(info->u.vesa_lfb.mode_attrs))
		screen_info->vesa_attributes = info->u.vesa_lfb.mode_attrs;
		break;
		}
		}

arch/x86/xen/xen-ops.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -88,6 +88,17 @@ static inline void xen_uninit_lock_cpu(int cpu)
		}
		#endif

		struct dom0_vga_console_info;

		#ifdef CONFIG_XEN_DOM0
		void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size);
		#else
		static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
		size_t size)
		{
		}
		#endif

		/* Declare an asm function, along with symbols needed to make it
		inlineable */
		#define DECL_ASM(ret, name, ...) \

include/xen/interface/xen.h

+39 −0

Original line number	Diff line number	Diff line
		@@ -449,6 +449,45 @@ struct start_info {
		int8_t cmd_line[MAX_GUEST_CMDLINE];
		};

		struct dom0_vga_console_info {
		uint8_t video_type;
		#define XEN_VGATYPE_TEXT_MODE_3 0x03
		#define XEN_VGATYPE_VESA_LFB 0x23

		union {
		struct {
		/* Font height, in pixels. */
		uint16_t font_height;
		/* Cursor location (column, row). */
		uint16_t cursor_x, cursor_y;
		/* Number of rows and columns (dimensions in characters). */
		uint16_t rows, columns;
		} text_mode_3;

		struct {
		/* Width and height, in pixels. */
		uint16_t width, height;
		/* Bytes per scan line. */
		uint16_t bytes_per_line;
		/* Bits per pixel. */
		uint16_t bits_per_pixel;
		/* LFB physical address, and size (in units of 64kB). */
		uint32_t lfb_base;
		uint32_t lfb_size;
		/* RGB mask offsets and sizes, as defined by VBE 1.2+ */
		uint8_t red_pos, red_size;
		uint8_t green_pos, green_size;
		uint8_t blue_pos, blue_size;
		uint8_t rsvd_pos, rsvd_size;

		/* VESA capabilities (offset 0xa, VESA command 0x4f00). */
		uint32_t gbl_caps;
		/* Mode attributes (offset 0x0, VESA command 0x4f01). */
		uint16_t mode_attrs;
		} vesa_lfb;
		} u;
		};

		/* These flags are passed in the 'flags' field of start_info_t. */
		#define SIF_PRIVILEGED (1<<0) /* Is the domain privileged? */
		#define SIF_INITDOMAIN (1<<1) /* Is this the initial control domain? */

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