On 02/18/17 07:21, b...@skyportsystems.com wrote: > From: Ben Warren <b...@skyportsystems.com> > > This allows BIOS to write data back to QEMU using the DMA interface and > provides a higher-level abstraction to write to a fw_cfg file > > Signed-off-by: Ben Warren <b...@skyportsystems.com> > --- > src/fw/paravirt.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ > src/fw/paravirt.h | 3 +++ > 2 files changed, 52 insertions(+)
Reviewed-by: Laszlo Ersek <ler...@redhat.com> Thanks Laszlo > diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c > index 6de70f6..4618647 100644 > --- a/src/fw/paravirt.c > +++ b/src/fw/paravirt.c > @@ -253,6 +253,20 @@ qemu_cfg_read(void *buf, int len) > } > > static void > +qemu_cfg_write(void *buf, int len) > +{ > + if (len == 0) { > + return; > + } > + > + if (qemu_cfg_dma_enabled()) { > + qemu_cfg_dma_transfer(buf, len, QEMU_CFG_DMA_CTL_WRITE); > + } else { > + warn_internalerror(); > + } > +} > + > +static void > qemu_cfg_skip(int len) > { > if (len == 0) { > @@ -280,6 +294,18 @@ qemu_cfg_read_entry(void *buf, int e, int len) > } > } > > +static void > +qemu_cfg_write_entry(void *buf, int e, int len) > +{ > + if (qemu_cfg_dma_enabled()) { > + u32 control = (e << 16) | QEMU_CFG_DMA_CTL_SELECT > + | QEMU_CFG_DMA_CTL_WRITE; > + qemu_cfg_dma_transfer(buf, len, control); > + } else { > + warn_internalerror(); > + } > +} > + > struct qemu_romfile_s { > struct romfile_s file; > int select, skip; > @@ -303,6 +329,29 @@ qemu_cfg_read_file(struct romfile_s *file, void *dst, > u32 maxlen) > return file->size; > } > > +int > +qemu_cfg_write_file(void *src, struct romfile_s *file, u32 offset, u32 len) > +{ > + if ((offset + len) > file->size) > + return -1; > + > + if (!qemu_cfg_dma_enabled() || (file->copy != qemu_cfg_read_file)) { > + warn_internalerror(); > + return -1; > + } > + struct qemu_romfile_s *qfile; > + qfile = container_of(file, struct qemu_romfile_s, file); > + if (offset == 0) { > + /* Do it in one transfer */ > + qemu_cfg_write_entry(src, qfile->select, len); > + } else { > + qemu_cfg_select(qfile->select); > + qemu_cfg_skip(offset); > + qemu_cfg_write(src, len); > + } > + return len; > +} > + > static void > qemu_romfile_add(char *name, int select, int skip, int size) > { > diff --git a/src/fw/paravirt.h b/src/fw/paravirt.h > index d8eb7c4..fb220d8 100644 > --- a/src/fw/paravirt.h > +++ b/src/fw/paravirt.h > @@ -3,6 +3,7 @@ > > #include "config.h" // CONFIG_* > #include "biosvar.h" // GET_GLOBAL > +#include "romfile.h" // struct romfile_s > > // Types of paravirtualized platforms. > #define PF_QEMU (1<<0) > @@ -43,6 +44,7 @@ static inline int runningOnKVM(void) { > #define QEMU_CFG_DMA_CTL_READ 0x02 > #define QEMU_CFG_DMA_CTL_SKIP 0x04 > #define QEMU_CFG_DMA_CTL_SELECT 0x08 > +#define QEMU_CFG_DMA_CTL_WRITE 0x10 > > // QEMU_CFG_DMA ID bit > #define QEMU_CFG_VERSION_DMA 2 > @@ -53,5 +55,6 @@ void qemu_platform_setup(void); > void qemu_cfg_init(void); > > u16 qemu_get_present_cpus_count(void); > +int qemu_cfg_write_file(void *src, struct romfile_s *file, u32 offset, u32 > len); > > #endif > _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org https://www.coreboot.org/mailman/listinfo/seabios