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cpu: Add new asidx_from_attrs() method 

Add a new method to CPUClass which the memory system core can
use to obtain the correct address space index to use for a memory
access with a given set of transaction attributes, together
with the wrapper function cpu_asidx_from_attrs() which implements
the default behaviour ("always use asidx 0") for CPU classes
which don't provide the method.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
This commit is contained in:
Peter Maydell 2016-01-21 14:15:05 +00:00
parent 1dc6fb1f5c
commit d7f25a9e6a
1 changed files with 20 additions and 0 deletions
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20
include/qom/cpu.h
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@ -102,6 +102,8 @@ struct TranslationBlock;
* associated memory transaction attributes to use for the access.
* CPUs which use memory transaction attributes should implement this
* instead of get_phys_page_debug.
* @asidx_from_attrs: Callback to return the CPU AddressSpace to use for
* a memory access with the specified memory transaction attributes.
* @gdb_read_register: Callback for letting GDB read a register.
* @gdb_write_register: Callback for letting GDB write a register.
* @debug_excp_handler: Callback for handling debug exceptions.
@ -158,6 +160,7 @@ typedef struct CPUClass {
hwaddr (*get_phys_page_debug)(CPUState *cpu, vaddr addr);
hwaddr (*get_phys_page_attrs_debug)(CPUState *cpu, vaddr addr,
MemTxAttrs *attrs);
int (*asidx_from_attrs)(CPUState *cpu, MemTxAttrs attrs);
int (*gdb_read_register)(CPUState *cpu, uint8_t *buf, int reg);
int (*gdb_write_register)(CPUState *cpu, uint8_t *buf, int reg);
void (*debug_excp_handler)(CPUState *cpu);
@ -492,6 +495,23 @@ static inline hwaddr cpu_get_phys_page_debug(CPUState *cpu, vaddr addr)
return cpu_get_phys_page_attrs_debug(cpu, addr, &attrs);
}
/** cpu_asidx_from_attrs:
* @cpu: CPU
* @attrs: memory transaction attributes
*
* Returns the address space index specifying the CPU AddressSpace
* to use for a memory access with the given transaction attributes.
*/
static inline int cpu_asidx_from_attrs(CPUState *cpu, MemTxAttrs attrs)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
if (cc->asidx_from_attrs) {
return cc->asidx_from_attrs(cpu, attrs);
}
return 0;
}
#endif
/**