s390/boot: introduce boot data 'initrd_data'

The new boot data struct shall replace global variables INITRD_START and
INITRD_SIZE. It is initialized in the decompressor and passed
to the decompressed kernel. In comparison to the old solution, this one
doesn't access data at fixed physical addresses which will become important
when the decompressor becomes relocatable.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

4 files changed, 17 insertions, 13 deletions

diff --git a/arch/s390/boot/ipl_report.c b/arch/s390/boot/ipl_report.c
index 0b4965573656..9b14045065b6 100644
--- a/arch/s390/boot/ipl_report.c
+++ b/arch/s390/boot/ipl_report.c
@@ -54,9 +54,9 @@ static unsigned long find_bootdata_space(struct ipl_rb_components *comps,
 	 * not overlap with any component or any certificate.
 	 */
 repeat:
-	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && INITRD_START && INITRD_SIZE &&
-	    intersects(INITRD_START, INITRD_SIZE, safe_addr, size))
-		safe_addr = INITRD_START + INITRD_SIZE;
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_data.start && initrd_data.size &&
+	    intersects(initrd_data.start, initrd_data.size, safe_addr, size))
+		safe_addr = initrd_data.start + initrd_data.size;
 	for_each_rb_entry(comp, comps)
 		if (intersects(safe_addr, size, comp->addr, comp->len)) {
 			safe_addr = comp->addr + comp->len;
diff --git a/arch/s390/boot/kaslr.c b/arch/s390/boot/kaslr.c
index 0dd48fbdbaa4..d8984462071f 100644
--- a/arch/s390/boot/kaslr.c
+++ b/arch/s390/boot/kaslr.c
@@ -186,9 +186,9 @@ unsigned long get_random_base(unsigned long safe_addr)
 	 */
 	memory_limit -= kasan_estimate_memory_needs(memory_limit);
 
-	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && INITRD_START && INITRD_SIZE) {
-		if (safe_addr < INITRD_START + INITRD_SIZE)
-			safe_addr = INITRD_START + INITRD_SIZE;
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_data.start && initrd_data.size) {
+		if (safe_addr < initrd_data.start + initrd_data.size)
+			safe_addr = initrd_data.start + initrd_data.size;
 	}
 	safe_addr = ALIGN(safe_addr, THREAD_SIZE);
 
diff --git a/arch/s390/boot/mem_detect.c b/arch/s390/boot/mem_detect.c
index ef15ea5284e0..2f949cd9076b 100644
--- a/arch/s390/boot/mem_detect.c
+++ b/arch/s390/boot/mem_detect.c
@@ -26,9 +26,9 @@ static void *mem_detect_alloc_extended(void)
 {
 	unsigned long offset = ALIGN(mem_safe_offset(), sizeof(u64));
 
-	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && INITRD_START && INITRD_SIZE &&
-	    INITRD_START < offset + ENTRIES_EXTENDED_MAX)
-		offset = ALIGN(INITRD_START + INITRD_SIZE, sizeof(u64));
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_data.start && initrd_data.size &&
+	    initrd_data.start < offset + ENTRIES_EXTENDED_MAX)
+		offset = ALIGN(initrd_data.start + initrd_data.size, sizeof(u64));
 
 	return (void *)offset;
 }
diff --git a/arch/s390/boot/startup.c b/arch/s390/boot/startup.c
index 8b07a704f2f5..694780339db0 100644
--- a/arch/s390/boot/startup.c
+++ b/arch/s390/boot/startup.c
@@ -23,6 +23,7 @@ unsigned long __bootdata_preserved(MODULES_VADDR);
 unsigned long __bootdata_preserved(MODULES_END);
 unsigned long __bootdata(ident_map_size);
 int __bootdata(is_full_image) = 1;
+struct initrd_data __bootdata(initrd_data);
 
 u64 __bootdata_preserved(stfle_fac_list[16]);
 u64 __bootdata_preserved(alt_stfle_fac_list[16]);
@@ -86,12 +87,12 @@ static void rescue_initrd(unsigned long addr)
 {
 	if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
 		return;
-	if (!INITRD_START || !INITRD_SIZE)
+	if (!initrd_data.start || !initrd_data.size)
 		return;
-	if (addr <= INITRD_START)
+	if (addr <= initrd_data.start)
 		return;
-	memmove((void *)addr, (void *)INITRD_START, INITRD_SIZE);
-	INITRD_START = addr;
+	memmove((void *)addr, (void *)initrd_data.start, initrd_data.size);
+	initrd_data.start = addr;
 }
 
 static void copy_bootdata(void)
@@ -283,6 +284,9 @@ void startup_kernel(void)
 	unsigned long safe_addr;
 	void *img;
 
+	initrd_data.start = parmarea.initrd_start;
+	initrd_data.size = parmarea.initrd_size;
+
 	setup_lpp();
 	store_ipl_parmblock();
 	safe_addr = mem_safe_offset();