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xtensa: minimize use of PLATFORM_DEFAULT_MEM_{ADDR,SIZE}

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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>
This commit is contained in:
Max Filippov 2016-07-23 02:47:58 +03:00
parent a9f2fc628e
commit 3de00482b0
4 changed files with 12 additions and 30 deletions
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18
arch/xtensa/Kconfig
View File

@ -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.

9
arch/xtensa/include/asm/page.h
View File

@ -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)

2
arch/xtensa/include/asm/processor.h
View File

@ -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

13
arch/xtensa/kernel/setup.c
View File

@ -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);