//----------- Begin of function Vga::flip ----------//
void Vga::flip()
{
mouse_cursor.before_flip();
vga_buffer.temp_unlock();
FlipBuffer (&vga_buffer);
vga_buffer.temp_restore_lock();
mouse_cursor.after_flip();
vga_buffer.bar_alpha( 0, 0, VGA_WIDTH-1, VGA_HEIGHT-1, 5, V_BLACK );
}
void BigInt_ModExp
(
uint8 *pu8X, uint16 u16XSize,
uint8 *pu8E, uint16 u16ESize,
uint8 *pu8M, uint16 u16MSize,
uint8 *pu8R, uint16 u16RSize
)
{
uint32 u32Reg;
uint8 au8Tmp[780] = {0};
uint32 u32XAddr = SHARED_MEM_BASE;
uint32 u32MAddr;
uint32 u32EAddr;
uint32 u32RAddr;
uint8 u8EMswBits = 32;
uint32 u32Mprime = 0x7F;
uint16 u16XSizeWords,u16ESizeWords;
uint32 u32Exponent;
u16XSizeWords = (u16XSize + 3) / 4;
u16ESizeWords = (u16ESize + 3) / 4;
u32MAddr = u32XAddr + (u16XSizeWords * 4);
u32EAddr = u32MAddr + (u16XSizeWords * 4);
u32RAddr = u32EAddr + (u16ESizeWords * 4);
/* Reset the core.
*/
u32Reg = 0;
u32Reg |= BIGINT_MISC_CTRL_CTL_RESET;
u32Reg = nm_read_reg(BIGINT_MISC_CTRL);
u32Reg &= ~BIGINT_MISC_CTRL_CTL_RESET;
u32Reg = nm_read_reg(BIGINT_MISC_CTRL);
nm_write_block(u32RAddr,au8Tmp, u16RSize);
/* Write Input Operands to Chip Memory.
*/
/*------- X -------*/
FlipBuffer(pu8X,au8Tmp,u16XSize);
nm_write_block(u32XAddr,au8Tmp,u16XSizeWords * 4);
/*------- E -------*/
m2m_memset(au8Tmp, 0, sizeof(au8Tmp));
FlipBuffer(pu8E, au8Tmp, u16ESize);
nm_write_block(u32EAddr, au8Tmp, u16ESizeWords * 4);
u32Exponent = GET_UINT32(au8Tmp, (u16ESizeWords * 4) - 4);
while((u32Exponent & NBIT31)== 0)
{
u32Exponent <<= 1;
u8EMswBits --;
}
/*------- M -------*/
m2m_memset(au8Tmp, 0, sizeof(au8Tmp));
FlipBuffer(pu8M, au8Tmp, u16XSize);
nm_write_block(u32MAddr, au8Tmp, u16XSizeWords * 4);
/* Program the addresses of the input operands.
*/
nm_write_reg(BIGINT_ADDR_X, u32XAddr);
nm_write_reg(BIGINT_ADDR_E, u32EAddr);
nm_write_reg(BIGINT_ADDR_M, u32MAddr);
nm_write_reg(BIGINT_ADDR_R, u32RAddr);
/* Mprime.
*/
nm_write_reg(BIGINT_M_PRIME,u32Mprime);
/* Length.
*/
u32Reg = (u16XSizeWords & 0xFF);
u32Reg += ((u16ESizeWords & 0xFF) << 8);
u32Reg += (u8EMswBits << 16);
nm_write_reg(BIGINT_LENGTH,u32Reg);
/* CTRL Register.
*/
u32Reg = nm_read_reg(BIGINT_MISC_CTRL);
u32Reg ^= BIGINT_MISC_CTRL_CTL_START;
u32Reg |= BIGINT_MISC_CTRL_CTL_FORCE_BARRETT;
//u32Reg |= BIGINT_MISC_CTRL_CTL_M_PRIME_VALID;
#if ENABLE_FLIPPING == 0
u32Reg |= BIGINT_MISC_CTRL_CTL_MSW_FIRST;
#endif
nm_write_reg(BIGINT_MISC_CTRL,u32Reg);
/* Wait for computation to complete. */
while(1)
{
u32Reg = nm_read_reg(BIGINT_IRQ_STS);
if(u32Reg & BIGINT_IRQ_STS_DONE)
{
break;
}
}
nm_write_reg(BIGINT_IRQ_STS,0);
m2m_memset(au8Tmp, 0, sizeof(au8Tmp));
nm_read_block(u32RAddr, au8Tmp, u16RSize);
FlipBuffer(au8Tmp, pu8R, u16RSize);
}
