From ce3fa1eca2c60673fede2222defb4bd13a3b5b1e Mon Sep 17 00:00:00 2001 From: Sam bobroff Date: Wed, 25 Jun 2014 13:54:29 +1000 Subject: [PATCH] spapr: Add rtas_st_buffer utility function 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 Signed-off-by: Alexander Graf --- include/hw/ppc/spapr.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index f71d7dec90..25ca87f244 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -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,