limine: Add support for base protocol revisions

This corrects an error which mistakenly says "the an Entry Point request (...)", in the section where the machine state at entry into the kernel is described.

common/protos/limine.c

@@ -342,6 +342,25 @@ noreturn void limine_load(char *config, char *cmdline) {
 
     kaslr = kaslr && is_reloc;
 
+    // Determine base revision
+    LIMINE_BASE_REVISION_1
+    int base_revision = 0;
+    for (size_t i = 0; i < ALIGN_DOWN(image_size_before_bss, 8); i += 8) {
+        void *p = (void *)(uintptr_t)physical_base + i;
+        int new_revision = 0;
+
+        if (memcmp(p, (void *)&limine_base_revision_1, 16) == 0) {
+            new_revision = 1;
+        }
+
+        if (new_revision != 0) {
+            if (base_revision != 0) {
+                panic(true, "limine: Duplicated base revision tag");
+            }
+            base_revision = new_revision;
+        }
+    }
+
     // Load requests
     if (elf64_load_section(kernel, &requests, ".limine_reqs", 0, slide)) {
         for (size_t i = 0; ; i++) {

limine.h

@@ -44,6 +44,9 @@ extern "C" {
 #  define LIMINE_DEPRECATED_IGNORE_END
 #endif
 
+#define LIMINE_BASE_REVISION_1 \
+    volatile uint64_t limine_base_revision_1[2] = { 0xf9562b2d5c95a6c8, 0x6a7b384944536bdc };
+
 #define LIMINE_COMMON_MAGIC 0xc7b1dd30df4c8b88, 0x0a82e883a194f07b
 
 struct limine_uuid {