x86: move reserve_setup_data to setup.c

Ying Huang would like setup_data to be reserved, but not included in the
no save range.

Here we try to modify the e820 table to reserve that range early.
also add that in early_res in case bootloader messes up with the ramdisk.

other solution would be
1. add early_res_to_highmem...
2. early_res_to_e820...
but they could reserve another type memory wrongly, if early_res has some
resource reserved early, and not needed later, but it is not removed from
early_res in time. Like the RAMDISK (already handled).

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: andi@firstfloor.org
Tested-by: Huang, Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Author: yhlu

arch/x86/kernel/e820.c

@@ -120,6 +120,7 @@ void __init e820_print_map(char *who)
 		       (e820.map[i].addr + e820.map[i].size));
 		switch (e820.map[i].type) {
 		case E820_RAM:
+		case E820_RESERVED_KERN:
 			printk(KERN_CONT "(usable)\n");
 			break;
 		case E820_RESERVED:
@@ -611,7 +612,7 @@ void __init e820_mark_nosave_regions(unsigned long limit_pfn)
 			register_nosave_region(pfn, PFN_UP(ei->addr));
 
 		pfn = PFN_DOWN(ei->addr + ei->size);
-		if (ei->type != E820_RAM)
+		if (ei->type != E820_RAM && ei->type != E820_RESERVED_KERN)
 			register_nosave_region(PFN_UP(ei->addr), pfn);
 
 		if (pfn >= limit_pfn)
@@ -1207,6 +1208,7 @@ void __init e820_reserve_resources(void)
 	res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
 	for (i = 0; i < e820.nr_map; i++) {
 		switch (e820.map[i].type) {
+		case E820_RESERVED_KERN:
 		case E820_RAM:	res->name = "System RAM"; break;
 		case E820_ACPI:	res->name = "ACPI Tables"; break;
 		case E820_NVS:	res->name = "ACPI Non-volatile Storage"; break;

arch/x86/kernel/head.c

@@ -53,21 +53,3 @@ void __init reserve_ebda_region(void)
 	/* reserve all memory between lowmem and the 1MB mark */
 	reserve_early_overlap_ok(lowmem, 0x100000, "BIOS reserved");
 }
-
-void __init reserve_setup_data(void)
-{
-	struct setup_data *data;
-	u64 pa_data;
-	char buf[32];
-
-	if (boot_params.hdr.version < 0x0209)
-		return;
-	pa_data = boot_params.hdr.setup_data;
-	while (pa_data) {
-		data = early_ioremap(pa_data, sizeof(*data));
-		sprintf(buf, "setup data %x", data->type);
-		reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
-		pa_data = data->next;
-		early_iounmap(data, sizeof(*data));
-	}
-}

arch/x86/kernel/head64.c

@@ -128,7 +128,6 @@ void __init x86_64_start_reservations(char *real_mode_data)
 #endif
 
 	reserve_ebda_region();
-	reserve_setup_data();
 
 	/*
 	 * At this point everything still needed from the boot loader

arch/x86/kernel/setup.c

@@ -389,14 +389,34 @@ static void __init parse_setup_data(void)
 		default:
 			break;
 		}
-#ifndef CONFIG_DEBUG_BOOT_PARAMS
-		free_early(pa_data, pa_data+sizeof(*data)+data->len);
-#endif
 		pa_data = data->next;
 		early_iounmap(data, PAGE_SIZE);
 	}
 }
 
+static void __init reserve_setup_data(void)
+{
+	struct setup_data *data;
+	u64 pa_data;
+	char buf[32];
+
+	if (boot_params.hdr.version < 0x0209)
+		return;
+	pa_data = boot_params.hdr.setup_data;
+	while (pa_data) {
+		data = early_ioremap(pa_data, sizeof(*data));
+		sprintf(buf, "setup data %x", data->type);
+		reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
+		e820_update_range(pa_data, sizeof(*data)+data->len,
+			 E820_RAM, E820_RESERVED_KERN);
+		pa_data = data->next;
+		early_iounmap(data, sizeof(*data));
+	}
+	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+	printk(KERN_INFO "extended physical RAM map:\n");
+	e820_print_map("reserve setup_data");
+}
+
 /*
  * --------- Crashkernel reservation ------------------------------
  */
@@ -523,7 +543,6 @@ void __init setup_arch(char **cmdline_p)
 	memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
 	pre_setup_arch_hook();
 	early_cpu_init();
-	reserve_setup_data();
 #else
 	printk(KERN_INFO "Command line: %s\n", boot_command_line);
 #endif
@@ -567,6 +586,8 @@ void __init setup_arch(char **cmdline_p)
 	ARCH_SETUP
 
 	setup_memory_map();
+	parse_setup_data();
+
 	copy_edd();
 
 	if (!boot_params.hdr.root_flags)
@@ -593,10 +614,11 @@ void __init setup_arch(char **cmdline_p)
 	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 	*cmdline_p = command_line;
 
-	parse_setup_data();
-
 	parse_early_param();
 
+	/* after early param, so could get panic from serial */
+	reserve_setup_data();
+
 	if (acpi_mps_check()) {
 #ifdef CONFIG_X86_LOCAL_APIC
 		disable_apic = 1;

include/asm-x86/bootparam.h

@@ -108,6 +108,4 @@ struct boot_params {
 	__u8  _pad9[276];				/* 0xeec */
 } __attribute__((packed));
 
-void reserve_setup_data(void);
-
 #endif /* _ASM_BOOTPARAM_H */

include/asm-x86/e820.h

@@ -44,6 +44,9 @@
 #define E820_ACPI	3
 #define E820_NVS	4
 
+/* reserved RAM used by kernel itself */
+#define E820_RESERVED_KERN        128
+
 #ifndef __ASSEMBLY__
 struct e820entry {
 	__u64 addr;	/* start of memory segment */