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authorMax Filippov <jcmvbkbc@gmail.com>2016-07-23 02:47:58 +0300
committerMax Filippov <jcmvbkbc@gmail.com>2016-07-24 06:33:59 +0300
commit3de00482b006daa110151ac6775adc52538a3d6a (patch)
treebd7a17e41872fdd386b5f548af88ee626fcdaba6 /arch/xtensa
parenta9f2fc628e3a26a829fd79aff74eb49839d1e74b (diff)
downloadlinux-3de00482b006daa110151ac6775adc52538a3d6a.tar.xz
xtensa: minimize use of PLATFORM_DEFAULT_MEM_{ADDR,SIZE}
Now that the kernel load address and KSEG physical base address have their own Kconfig symbols PLATFORM_DEFAULT_MEM seems redundant. It makes little sense to use it in MMU configurations instead of KSEG_PADDR. In noMMU configurations there's no explicit KSEG, so it's still useful for the early cache initialization and definition of ARCH_PFN_OFFSET, which affects mem_map size. - limit it to noMMU; MMU variants have XCHAL_KSEG_PADDR and XCHAL_KSEG_SIZE; - don't use it to define TASK_SIZE or MAX_LOW_PFN: first doesn't make any difference in noMMU, second is meaningless as there's no high memory; - don't add default physical memory region: memory layout should come from the DT, bootloader tags, or memmap= command line parameter. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/Kconfig18
-rw-r--r--arch/xtensa/include/asm/page.h9
-rw-r--r--arch/xtensa/include/asm/processor.h2
-rw-r--r--arch/xtensa/kernel/setup.c13
4 files changed, 12 insertions, 30 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 9b1f8c3c8cba..7a4c77b39ce0 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -394,7 +394,7 @@ config XTENSA_PLATFORM_XT2000
config XTENSA_PLATFORM_XTFPGA
bool "XTFPGA"
select ETHOC if ETHERNET
- select PLATFORM_WANT_DEFAULT_MEM
+ select PLATFORM_WANT_DEFAULT_MEM if !MMU
select SERIAL_CONSOLE
select XTENSA_CALIBRATE_CCOUNT
help
@@ -502,11 +502,9 @@ config DEFAULT_MEM_START
default 0x00000000 if MMU
default 0x60000000 if !MMU
help
- This is a fallback start address of the default memory area, it is
- used when no physical memory size is passed through DTB or through
- boot parameter from bootloader.
-
- It's also used for TASK_SIZE calculation in noMMU configuration.
+ This is the base address of the default memory area.
+ Default memory area has platform-specific meaning, it may be used
+ for e.g. early cache initialization.
If unsure, leave the default value here.
@@ -515,11 +513,9 @@ config DEFAULT_MEM_SIZE
depends on PLATFORM_WANT_DEFAULT_MEM
default 0x04000000
help
- This is a fallback size of the default memory area, it is used when
- no physical memory size is passed through DTB or through boot
- parameter from bootloader.
-
- It's also used for TASK_SIZE calculation in noMMU configuration.
+ This is the size of the default memory area.
+ Default memory area has platform-specific meaning, it may be used
+ for e.g. early cache initialization.
If unsure, leave the default value here.
diff --git a/arch/xtensa/include/asm/page.h b/arch/xtensa/include/asm/page.h
index 3b5a49dbf8b2..976b1d70edbc 100644
--- a/arch/xtensa/include/asm/page.h
+++ b/arch/xtensa/include/asm/page.h
@@ -31,10 +31,9 @@
#define MAX_LOW_PFN (PHYS_PFN(XCHAL_KSEG_PADDR) + \
PHYS_PFN(XCHAL_KSEG_SIZE))
#else
-#define PAGE_OFFSET __XTENSA_UL_CONST(0)
-#define PHYS_OFFSET __XTENSA_UL_CONST(0)
-#define MAX_LOW_PFN (PHYS_PFN(PLATFORM_DEFAULT_MEM_START) + \
- PHYS_PFN(PLATFORM_DEFAULT_MEM_SIZE))
+#define PAGE_OFFSET PLATFORM_DEFAULT_MEM_START
+#define PHYS_OFFSET PLATFORM_DEFAULT_MEM_START
+#define MAX_LOW_PFN PHYS_PFN(0xfffffffful)
#endif
#define PGTABLE_START 0x80000000
@@ -163,7 +162,7 @@ void copy_user_highpage(struct page *to, struct page *from,
* addresses.
*/
-#define ARCH_PFN_OFFSET (PLATFORM_DEFAULT_MEM_START >> PAGE_SHIFT)
+#define ARCH_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
#define __pa(x) \
((unsigned long) (x) - PAGE_OFFSET + PHYS_OFFSET)
diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h
index d2e40d39c615..b42d68bfe3cf 100644
--- a/arch/xtensa/include/asm/processor.h
+++ b/arch/xtensa/include/asm/processor.h
@@ -37,7 +37,7 @@
#ifdef CONFIG_MMU
#define TASK_SIZE __XTENSA_UL_CONST(0x40000000)
#else
-#define TASK_SIZE (PLATFORM_DEFAULT_MEM_START + PLATFORM_DEFAULT_MEM_SIZE)
+#define TASK_SIZE __XTENSA_UL_CONST(0xffffffff)
#endif
#define STACK_TOP TASK_SIZE
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 9735691f37f1..0e59b8900e6a 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -188,7 +188,6 @@ static int __init parse_bootparam(const bp_tag_t* tag)
}
#ifdef CONFIG_OF
-bool __initdata dt_memory_scan = false;
#if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
@@ -228,9 +227,6 @@ static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
- if (!dt_memory_scan)
- return;
-
size &= PAGE_MASK;
add_sysmem_bank(base, base + size);
}
@@ -242,9 +238,6 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
void __init early_init_devtree(void *params)
{
- if (sysmem.nr_banks == 0)
- dt_memory_scan = true;
-
early_init_dt_scan(params);
of_scan_flat_dt(xtensa_dt_io_area, NULL);
@@ -278,12 +271,6 @@ void __init init_arch(bp_tag_t *bp_start)
early_init_devtree(dtb_start);
#endif
- if (sysmem.nr_banks == 0) {
- add_sysmem_bank(PLATFORM_DEFAULT_MEM_START,
- PLATFORM_DEFAULT_MEM_START +
- PLATFORM_DEFAULT_MEM_SIZE);
- }
-
#ifdef CONFIG_CMDLINE_BOOL
if (!command_line[0])
strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);