From ddccc7d7ff81003287b4aa0eb819b4fc33a2c8df Mon Sep 17 00:00:00 2001
From: TomAwezome <sonidd1@yahoo.com>
Date: Sat, 20 Aug 2022 11:46:30 -0400
Subject: [PATCH] Begin attempt to get limine framebuffer and combine it into
 kernel data members. TODO: update SYS_KERNEL DU members.

---
 src/Kernel/KernelA.HH   | 20 ++++++++++++++++++++
 zealbooter/zealbooter.c |  9 +++++++++
 2 files changed, 29 insertions(+)

diff --git a/src/Kernel/KernelA.HH b/src/Kernel/KernelA.HH
index 2729c8f3..56c565b4 100755
--- a/src/Kernel/KernelA.HH
+++ b/src/Kernel/KernelA.HH
@@ -544,6 +544,25 @@ class CVBEModeShort
 	U32 	max_pixel_clock; //TODO refresh rates.
 };
 
+class CLimineFramebuffer
+{
+	U8 *address;
+	U64	width,
+		height,
+		pitch;
+	U16 bpp;
+	U8	memory_model,
+		red_mask_size,
+		red_mask_shift,
+		green_mask_size,
+		green_mask_shift,
+		blue_mask_size,
+		blue_mask_shift,
+		unused[7];
+	U64 edid_size;
+	U8 *edid;
+};
+
 #help_index "Boot"
 class CKernel
 {//Must match $LK,"OSStartUp",A="FF:::/Kernel/KStart16.ZC,MEM_BOOT_BASE"$
@@ -565,6 +584,7 @@ class CKernel
 	;$$ = ($$ + 15) & -16;
 	CGDT			sys_gdt;
 	U32				sys_font_ptr;
+	CLimineFramebuffer limine_framebuffer;
 	CVBEInfo		sys_vbe_info;
 	CVBEModeShort	sys_vbe_modes[VBE_MODES_NUM];
 	CVBEMode		sys_vbe_mode;
diff --git a/zealbooter/zealbooter.c b/zealbooter/zealbooter.c
index f67bf09e..fd029240 100644
--- a/zealbooter/zealbooter.c
+++ b/zealbooter/zealbooter.c
@@ -18,6 +18,11 @@ static volatile struct limine_memmap_request memmap_request = {
     .revision = 0
 };
 
+static volatile struct limine_framebuffer_request framebuffer_request = {
+    .id = LIMINE_FRAMEBUFFER_REQUEST,
+    .revision = 0
+};
+
 #define MEM_E820_ENTRIES_NUM 48
 
 #define MEM_E820T_USABLE 1
@@ -93,6 +98,7 @@ struct CKernel {
     uint16_t sys_pci_buses;
     struct CGDT sys_gdt;
     uint32_t sys_font_ptr;
+    struct limine_framebuffer limine_fb;
 } __attribute__((packed));
 
 #define BOOT_SRC_RAM 2
@@ -195,6 +201,9 @@ void _start(void) {
         CKernel->mem_E820[i].type = our_type;
     }
 
+    struct limine_framebuffer *framebuffer = framebuffer_request.response->framebuffers[0];
+    memcpy(&CKernel->limine_fb, framebuffer, sizeof(struct limine_framebuffer));
+
     void *target_addr = (void *)lower - kernel_address_request.response->virtual_base;
     target_addr += kernel_address_request.response->physical_base;