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ARM: 7465/1: Handle >4GB memory sizes in device tree and mem=size@start option 

The memory regions which are passed to arm_add_memory() from
device tree blobs via early_init_dt_add_memory_arch() can
have sizes which are larger than will fit in a 32 bit integer,
so switch to using a phys_addr_t to hold them, to avoid
silently dropping the top 32 bits of the size. Similarly, use
phys_addr_t in early_mem() so that mem=size@start command line
options specifying more than 4GB behave sensibly.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Peter Maydell 2012-07-12 23:57:35 +01:00 committed by Russell King
parent ff081e05bf
commit a5d5f7daa7
2 changed files with 5 additions and 5 deletions
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4
arch/arm/include/asm/setup.h
View File

@ -196,7 +196,7 @@ static const struct tagtable __tagtable_##fn __tag = { tag, fn }
struct membank {
phys_addr_t start;
unsigned long size;
phys_addr_t size;
unsigned int highmem;
};
@ -217,7 +217,7 @@ extern struct meminfo meminfo;
#define bank_phys_end(bank) ((bank)->start + (bank)->size)
#define bank_phys_size(bank) (bank)->size
extern int arm_add_memory(phys_addr_t start, unsigned long size);
extern int arm_add_memory(phys_addr_t start, phys_addr_t size);
extern void early_print(const char *str, ...);
extern void dump_machine_table(void);

6
arch/arm/kernel/setup.c
View File

@ -508,7 +508,7 @@ void __init dump_machine_table(void)
/* can't use cpu_relax() here as it may require MMU setup */;
}
int __init arm_add_memory(phys_addr_t start, unsigned long size)
int __init arm_add_memory(phys_addr_t start, phys_addr_t size)
{
struct membank *bank = &meminfo.bank[meminfo.nr_banks];
@ -538,7 +538,7 @@ int __init arm_add_memory(phys_addr_t start, unsigned long size)
}
#endif
bank->size = size & PAGE_MASK;
bank->size = size & ~(phys_addr_t)(PAGE_SIZE - 1);
/*
* Check whether this memory region has non-zero size or
@ -558,7 +558,7 @@ int __init arm_add_memory(phys_addr_t start, unsigned long size)
static int __init early_mem(char *p)
{
static int usermem __initdata = 0;
unsigned long size;
phys_addr_t size;
phys_addr_t start;
char *endp;