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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/** @addtogroup mips32mm   
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/** @addtogroup mips32mm
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 * @{
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 * @{
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 */
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 */
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/** @file
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/** @file
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 */
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 */
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#include <interrupt.h>
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#include <interrupt.h>
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#include <mm/frame.h>
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#include <mm/frame.h>
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#include <mm/asid.h>
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#include <mm/asid.h>
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#include <config.h>
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#include <config.h>
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#include <arch/drivers/msim.h>
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#include <arch/drivers/msim.h>
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#include <arch/drivers/serial.h>
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#include <print.h>
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#include <print.h>
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#define ZERO_PAGE_MASK      TLB_PAGE_MASK_256K
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#define ZERO_PAGE_MASK    TLB_PAGE_MASK_256K
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#define ZERO_FRAMES         2048
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#define ZERO_FRAMES       2048
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#define ZERO_PAGE_WIDTH     18  /* 256K */
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#define ZERO_PAGE_WIDTH   18  /* 256K */
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#define ZERO_PAGE_SIZE      (1 << ZERO_PAGE_WIDTH)
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#define ZERO_PAGE_SIZE    (1 << ZERO_PAGE_WIDTH)
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#define ZERO_PAGE_ASID      ASID_INVALID
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#define ZERO_PAGE_ASID    ASID_INVALID
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#define ZERO_PAGE_TLBI      0
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#define ZERO_PAGE_TLBI    0
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#define ZERO_PAGE_ADDR      0
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#define ZERO_PAGE_ADDR    0
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#define ZERO_PAGE_OFFSET    (ZERO_PAGE_SIZE / sizeof(uint32_t) - 1)
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#define ZERO_PAGE_OFFSET  (ZERO_PAGE_SIZE / sizeof(uint32_t) - 1)
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#define ZERO_PAGE_VALUE     (((volatile uint32_t *) ZERO_PAGE_ADDR)[ZERO_PAGE_OFFSET])
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#define ZERO_PAGE_VALUE   (((volatile uint32_t *) ZERO_PAGE_ADDR)[ZERO_PAGE_OFFSET])
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- 
 
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#define ZERO_PAGE_VALUE_KSEG1(frame) \
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#define ZERO_PAGE_VALUE_KSEG1(frame) (((volatile uint32_t *) (0xa0000000 + (frame << ZERO_PAGE_WIDTH)))[ZERO_PAGE_OFFSET])
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    (((volatile uint32_t *) (0xa0000000 + (frame << ZERO_PAGE_WIDTH)))[ZERO_PAGE_OFFSET])
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#define MAX_REGIONS         32
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#define MAX_REGIONS  32
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typedef struct {
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typedef struct {
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    pfn_t start;
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    pfn_t start;
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    pfn_t count;
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    pfn_t count;
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} phys_region_t;
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} phys_region_t;
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static count_t phys_regions_count = 0;
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static count_t phys_regions_count = 0;
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static phys_region_t phys_regions[MAX_REGIONS];
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static phys_region_t phys_regions[MAX_REGIONS];
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/** Check whether frame is available
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/** Check whether frame is available
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 *
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 *
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 * Returns true if given frame is generally available for use.
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 * Returns true if given frame is generally available for use.
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 * Returns false if given frame is used for physical memory
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 * Returns false if given frame is used for physical memory
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 * mapped devices and cannot be used.
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 * mapped devices and cannot be used.
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 *
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 *
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 */
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 */
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static bool frame_available(pfn_t frame)
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static bool frame_available(pfn_t frame)
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{
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{
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#if MACHINE == msim
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#ifdef MACHINE_msim
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    /* MSIM device (dprinter) */
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    /* MSIM device (dprinter) */
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    if (frame == (KA2PA(MSIM_VIDEORAM) >> ZERO_PAGE_WIDTH))
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    if (frame == (KA2PA(MSIM_VIDEORAM) >> ZERO_PAGE_WIDTH))
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        return false;
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        return false;
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    /* MSIM device (dkeyboard) */
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    /* MSIM device (dkeyboard) */
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    if (frame == (KA2PA(MSIM_KBD_ADDRESS) >> ZERO_PAGE_WIDTH))
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    if (frame == (KA2PA(MSIM_KBD_ADDRESS) >> ZERO_PAGE_WIDTH))
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        return false;
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        return false;
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#endif
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#endif
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#if MACHINE == simics
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    /* Simics device (serial line) */
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    if (frame == (KA2PA(SERIAL_ADDRESS) >> ZERO_PAGE_WIDTH))
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        return false;
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#endif
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#if (MACHINE == lgxemul) || (MACHINE == bgxemul)
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#if defined(MACHINE_lgxemul) || defined(MACHINE_bgxemul)
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    /* gxemul devices */
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    /* gxemul devices */
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    if (overlaps(frame << ZERO_PAGE_WIDTH, ZERO_PAGE_SIZE,
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    if (overlaps(frame << ZERO_PAGE_WIDTH, ZERO_PAGE_SIZE,
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        0x10000000, MB2SIZE(256)))
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        0x10000000, MB2SIZE(256)))
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        return false;
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        return false;
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#endif
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#endif
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                    avail = false;
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                    avail = false;
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                else {
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                else {
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                    ZERO_PAGE_VALUE = 0xdeadbeef;
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                    ZERO_PAGE_VALUE = 0xdeadbeef;
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                    if (ZERO_PAGE_VALUE != 0xdeadbeef)
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                    if (ZERO_PAGE_VALUE != 0xdeadbeef)
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                        avail = false;
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                        avail = false;
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#if (MACHINE == lgxemul) || (MACHINE == bgxemul)
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#if defined(MACHINE_lgxemul) || defined(MACHINE_bgxemul)
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                    else {
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                    else {
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                        ZERO_PAGE_VALUE_KSEG1(frame) = 0xaabbccdd;
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                        ZERO_PAGE_VALUE_KSEG1(frame) = 0xaabbccdd;
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                        if (ZERO_PAGE_VALUE_KSEG1(frame) != 0xaabbccdd)
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                        if (ZERO_PAGE_VALUE_KSEG1(frame) != 0xaabbccdd)
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                            avail = false;
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                            avail = false;
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                    }
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                    }