Subhobhai943/SUB-OS
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feat(gui): Enable direct boot to GUI Desktop with emergency kernel TTY fallback

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- Integrate Bochs/QEMU VBE physical LFB mapping directly to hardware video memory (0xFD000000)
- Update kernel boot sequence to directly boot into GUI Desktop by default
- Fall back to Emergency Kernel TTY Mode upon GUI exit (Esc key / Exit menu item)
- Support 'nogui', 'text', 'emergency', and 'single' boot arguments to boot directly into text mode
- Remove frame limits so GUI runs persistently
This commit is contained in:
subhobhai943 committed 2026-08-21 03:08:31 +05:30
1 parent 81a17aae37
commit 56d8b3af1a
5 files changed
+75 -49
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drivers/video/bochs.c
+46 -41
View File
@@ -1,3 +1,4 @@
// Bochs / QEMU VBE Display Adapter Driver for SUB-OS
#include <drivers/bochs.h>
#include <arch/x86_64/io.h>
#include <drivers/pci.h>
@@ -17,46 +18,6 @@ static uint16_t vbe_read(uint16_t index) {
return inw(VBE_DISPI_IOPORT_DATA);
}
bool bochs_vbe_init(void) {
memset(&vbe_info, 0, sizeof(vbe_info));
// Probe VBE DISPI interface
uint16_t id = vbe_read(VBE_DISPI_INDEX_ID);
if ((id & 0xB0C0) == 0xB0C0) {
vbe_info.available = true;
vbe_info.vbe_version = id;
vbe_info.current_width = 1024;
vbe_info.current_height = 768;
vbe_info.current_bpp = 32;
pci_device_t* vga_pci = pci_find_class(0x03, 0x00);
if (vga_pci) {
vbe_info.lfb_phys_addr = vga_pci->bar[0] & ~0xF;
} else {
vbe_info.lfb_phys_addr = 0xFD000000;
}
printk(KERN_INFO "VBE: Bochs/QEMU VBE Display Adapter detected (v%04x, Linear Framebuffer: 0x%llx)\n",
vbe_info.vbe_version, vbe_info.lfb_phys_addr);
return true;
}
// Software emulated VBE fallback
vbe_info.available = true;
vbe_info.vbe_version = 0xB0C5;
vbe_info.current_width = 800;
vbe_info.current_height = 600;
vbe_info.current_bpp = 32;
vbe_info.lfb_phys_addr = 0xFD000000;
printk(KERN_INFO "VBE: Standard VESA/VBE Display Engine online (800x600 32bpp TrueColor)\n");
return true;
}
bool bochs_vbe_is_available(void) {
return vbe_info.available;
}
int bochs_vbe_set_mode(uint32_t width, uint32_t height, uint32_t bpp) {
if (!vbe_info.available) return -1;
@@ -70,10 +31,54 @@ int bochs_vbe_set_mode(uint32_t width, uint32_t height, uint32_t bpp) {
vbe_info.current_height = height;
vbe_info.current_bpp = bpp;
printk(KERN_INFO "VBE: Switched resolution to %ux%u @ %u bpp\n", width, height, bpp);
// Connect global Framebuffer driver directly to hardware video memory
fb_set_hardware_lfb((uint32_t*)vbe_info.lfb_phys_addr, width, height, (uint8_t)bpp);
printk(KERN_INFO "VBE: Switched resolution to %ux%u @ %u bpp (LFB: 0x%llx)\n",
width, height, bpp, vbe_info.lfb_phys_addr);
return 0;
}
bool bochs_vbe_init(void) {
memset(&vbe_info, 0, sizeof(vbe_info));
// Probe VBE DISPI interface
uint16_t id = vbe_read(VBE_DISPI_INDEX_ID);
if ((id & 0xB0C0) == 0xB0C0) {
vbe_info.available = true;
vbe_info.vbe_version = id;
pci_device_t* vga_pci = pci_find_class(PCI_CLASS_DISPLAY, PCI_SUBCLASS_ETHERNET); // Check Display class
if (!vga_pci) vga_pci = pci_find_device(0x1234, 0x1111); // QEMU Standard VGA
if (!vga_pci) vga_pci = pci_find_device(0x8086, 0x1237); // Intel PCI host
if (vga_pci && vga_pci->bar[0] != 0) {
vbe_info.lfb_phys_addr = vga_pci->bar[0] & ~0xF;
} else {
vbe_info.lfb_phys_addr = 0xFD000000;
}
bochs_vbe_set_mode(320, 200, 32);
printk(KERN_INFO "VBE: Bochs/QEMU VBE Display Adapter detected (v%04x, Linear Framebuffer: 0x%llx)\n",
vbe_info.vbe_version, vbe_info.lfb_phys_addr);
return true;
}
// Software emulated VBE fallback
vbe_info.available = true;
vbe_info.vbe_version = 0xB0C5;
vbe_info.lfb_phys_addr = 0xFD000000;
bochs_vbe_set_mode(320, 200, 32);
printk(KERN_INFO "VBE: Standard VESA/VBE Display Engine online (320x200 32bpp TrueColor)\n");
return true;
}
bool bochs_vbe_is_available(void) {
return vbe_info.available;
}
const bochs_vbe_info_t* bochs_vbe_get_info(void) {
return &vbe_info;
}