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spapr: Add rtas_st_buffer utility function

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Add a function to write lengh + data into a buffer as required for the
emulation of the RTAS ibm,get-system-parameter call.

If the destination is smaller than the source, the write is truncated
and success is returned. This matches the behaviour of pHyp.

This will be used in following patches.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Sam bobroff 2014-06-25 13:54:29 +10:00 committed by Alexander Graf
parent 6026db4501
commit ce3fa1eca2
1 changed files with 13 additions and 0 deletions
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13
include/hw/ppc/spapr.h
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@ -412,6 +412,19 @@ static inline void rtas_st(target_ulong phys, int n, uint32_t val)
stl_be_phys(&address_space_memory, ppc64_phys_to_real(phys + 4*n), val);
}
static inline void rtas_st_buffer(target_ulong phys, target_ulong phys_len,
uint8_t *buffer, uint16_t buffer_len)
{
if (phys_len < 2) {
return;
}
stw_be_phys(&address_space_memory,
ppc64_phys_to_real(phys), buffer_len);
cpu_physical_memory_write(ppc64_phys_to_real(phys + 2),
buffer, MIN(buffer_len, phys_len - 2));
}
typedef void (*spapr_rtas_fn)(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token,
uint32_t nargs, target_ulong args,