X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=x86_64%2Fsysdeps.h;h=338aa40bfbb6aa4ed28f2e543fe6ad0dfc52b559;hb=3384f0373c8758e5ddd08f489ad7110898dd5406;hp=af89cb186f8a74d080ad79fdd9759985fe6a381f;hpb=528b4479a96491431b243bf02da43c792962fb27;p=debian%2Felilo

diff --git a/x86_64/sysdeps.h b/x86_64/sysdeps.h
index af89cb1..338aa40 100644
--- a/x86_64/sysdeps.h
+++ b/x86_64/sysdeps.h
@@ -47,6 +47,10 @@
  */
 #define INITRD_START   (50*1024*1024)
 
+/* Default start address for kernel. */
+#define DEFAULT_KERNEL_START   0x100000
+
+
 /*
  * This version must match the one in the kernel.
  *
@@ -307,10 +311,16 @@ typedef union x86_64_boot_params {
 	UINT8 *t = (UINT8 *)(to); \
 	UINT8 *f = (UINT8 *)(from); \
 	UINTN n = cnt; \
-	if (t && f && n) { \
+	if (t && f && n && (t<f)) { \
 		while (n--) { \
 			*t++ = *f++; \
 		} \
+	} else if (t && f && n && (t>f)) { \
+		t += n; \
+		f += n; \
+		while (n--) { \
+			*t-- = *f--; \
+		} \
 	} \
 }
 
@@ -343,6 +353,7 @@ extern UINTN param_size;
 
 extern VOID *kernel_start;
 extern UINTN kernel_size;
+extern VOID *kernel_load_address;
 
 extern VOID *initrd_start;
 extern UINTN initrd_size;
@@ -370,8 +381,8 @@ start_kernel(VOID *kentry, boot_params_t *bp)
 		UINT32	kernel_entry;
 		UINT16	kernel_cs;
 	} jumpvector;
-	UINTN	njump;
 	VOID 	*jump_start;
+	uint64_t temp;
 
 	/*
 	 * Disable interrupts.
@@ -379,11 +390,20 @@ start_kernel(VOID *kentry, boot_params_t *bp)
 	asm volatile ( "cli" : : );
 
 	/*
-	 * Relocate initrd, if present.
+	 * Relocate kernel (if needed), and initrd (if present).
+	 * Copy kernel first, in case kernel was loaded overlapping where we're
+	 * planning to copy the initrd.  This assumes that the initrd didn't
+	 * get loaded overlapping where we're planning to copy the kernel, but
+	 * that's pretty unlikely since we couldn't alloc that space for the
+	 * kernel (or the kernel would already be there).
 	 */
+	if (kernel_start != kernel_load_address) {
+		MEMCPY(kernel_start, kernel_load_address, kernel_size);
+	}
 
 	if (bp->s.initrd_start) {
-		MEMCPY(INITRD_START, bp->s.initrd_start, bp->s.initrd_size);
+		temp =  bp->s.initrd_start;
+		MEMCPY(INITRD_START, temp , bp->s.initrd_size);
 		bp->s.initrd_start = INITRD_START;
 	}
 	/*
@@ -434,14 +454,15 @@ start_kernel(VOID *kentry, boot_params_t *bp)
 
 	/*
 	 * Jump to kernel entry point.
+	 *
+	 * Cast is to tell gcc that we know we're going from
+	 * 64-bit ptr to 32-bit integer.
 	 */
-	jumpvector.kernel_entry=kentry;
+	jumpvector.kernel_entry=(UINT32)((UINT64)kentry);
 	jumpvector.kernel_cs=0x10;
-	njump = &jumpvector;
 	jump_start = (VOID *)&jumpvector;
 	//asm volatile ( "mov %0, %%rcx" : : "m" (&jumpvector) );
 	asm volatile ( "mov %0, %%rcx" : : "m" (jump_start) );
-	//asm volatile ( "mov %0, %%rcx" : : "m" (njump) );
 	asm volatile ( "ljmp *(%%rcx)" : :);
 	/* Never come back to here. */
 }