source: soft/giet_vm/giet_common/vmem.c @ 756

///////////////////////////////////////////////////////////////////////////////////
// File     : vmem.c
// Date     : 01/07/2012
// Author   : alain greiner
// Copyright (c) UPMC-LIP6
///////////////////////////////////////////////////////////////////////////////////

#include <tty0.h>
#include <utils.h>
#include <vmem.h>
#include <ctx_handler.h>
#include <kernel_locks.h>
#include <giet_config.h>

//////////////////////////////////////////////////////////////////////////////////
// Extern global variables (allocated in boot.c or kernel_init.c) 
//////////////////////////////////////////////////////////////////////////////////

extern  spin_lock_t         _ptabs_spin_lock[GIET_NB_VSPACE_MAX][X_SIZE][Y_SIZE];
extern  unsigned long long  _ptabs_paddr[GIET_NB_VSPACE_MAX][X_SIZE][Y_SIZE];
extern  unsigned int        _ptabs_next_pt2[GIET_NB_VSPACE_MAX][X_SIZE][Y_SIZE];
extern  unsigned int        _ptabs_max_pt2;

///////////////////////////////////////////////////////
unsigned long long _v2p_translate( unsigned int  vaddr,
                                   unsigned int* flags )
{
    unsigned long long ptba;
    unsigned long long pte2_paddr;

    unsigned int pte2_msb;
    unsigned int pte2_lsb;
    unsigned int flags_value;
    unsigned int ppn_value;

    unsigned int save_sr;
  
    // decode the vaddr fields
    unsigned int offset = vaddr & 0xFFF;
    unsigned int ix1    = (vaddr >> 21) & 0x7FF;
    unsigned int ix2    = (vaddr >> 12) & 0x1FF;

    // get page table vbase address
    page_table_t* pt = (page_table_t*)_get_context_slot(CTX_PTAB_ID);

    // get PTE1
    unsigned int pte1 = pt->pt1[ix1];

    // check PTE1 mapping
    if ( (pte1 & PTE_V) == 0 )
    {
        _printf("\n[VMEM ERROR] _v2p_translate() : pte1 unmapped\n"
                "  vaddr = %x / ptab = %x / pte1_vaddr = %x / pte1_value = %x\n",
                vaddr , (unsigned int)pt, &(pt->pt1[ix1]) , pte1 );
        _exit();
    }

    // test big/small page
    if ( (pte1 & PTE_T) == 0 )  // big page
    {
        *flags = pte1 & 0xFFC00000;
        offset = offset | (ix2<<12);
        return (((unsigned long long)(pte1 & 0x7FFFF)) << 21) | offset;
    }
    else                        // small page
    {

        // get physical addresses of pte2
        ptba       = ((unsigned long long)(pte1 & 0x0FFFFFFF)) << 12;
        pte2_paddr = ptba + 8*ix2;

        // split physical address in two 32 bits words
        pte2_lsb   = (unsigned int) pte2_paddr;
        pte2_msb   = (unsigned int) (pte2_paddr >> 32);

        // disable interrupts and save status register
        _it_disable( &save_sr );

        // get ppn_value and flags_value, using a physical read
        // after temporary DTLB desactivation
        asm volatile (
                "mfc2    $2,     $1          \n"     /* $2 <= MMU_MODE       */
                "andi    $3,     $2,    0xb  \n"
                "mtc2    $3,     $1          \n"     /* DTLB off             */

                "move    $4,     %3          \n"     /* $4 <= pte_lsb        */
                "mtc2    %2,     $24         \n"     /* PADDR_EXT <= pte_msb */
                "lw      %0,     0($4)       \n"     /* read flags           */ 
                "lw      %1,     4($4)       \n"     /* read ppn             */
                "mtc2    $0,     $24         \n"     /* PADDR_EXT <= 0       */

                "mtc2    $2,     $1          \n"     /* restore MMU_MODE     */
                : "=r" (flags_value), "=r" (ppn_value)
                : "r"  (pte2_msb)   , "r"  (pte2_lsb)
                : "$2", "$3", "$4" );

        // restore saved status register
        _it_restore( &save_sr );

        // check PTE2 mapping
        if ( (flags_value & PTE_V) == 0 )
        {
            _printf("\n[VMEM ERROR] _v2p_translate() : pte2 unmapped\n"
                    "  vaddr = %x / ptab = %x / pte1_value = %x\n"
                    "  pte2_paddr = %l / ppn = %x / flags = %x\n",
                    vaddr , pt , pte1 , pte2_paddr ,  ppn_value , flags_value );
            _exit();
        }

        *flags = flags_value & 0xFFC00000;
        return (((unsigned long long)(ppn_value & 0x0FFFFFFF)) << 12) | offset;
    }
} // end _v2p_translate()


////////////////////////////////////////////
void _v2p_add_pte1( unsigned int vspace_id,
                    unsigned int x,
                    unsigned int y,
                    unsigned int vpn,        // 20 bits right-justified
                    unsigned int flags,      // 10 bits left-justified 
                    unsigned int ppn,        // 28 bits right-justified
                    unsigned int ident )     // identity mapping if non zero
{
    unsigned int   pte1;     // PTE1 value
    paddr_t        paddr;    // PTE1 physical address

    // compute index in PT1
    unsigned int    ix1 = vpn >> 9;         // 11 bits for ix1

    // get PT1 physical base address 
    paddr_t  pt1_base = _ptabs_paddr[vspace_id][x][y];

    if ( pt1_base == 0 )
    {
        _printf("\n[GIET ERROR] in _v2p_add_pte1() : no PTAB in cluster[%d,%d]"
                    " containing processors\n", x , y );
        _exit();
    }

    // get lock protecting PTAB[vspace_id][x][y]
    _spin_lock_acquire( &_ptabs_spin_lock[vspace_id][x][y] );

    // compute pte1 physical address
    paddr = pt1_base + 4*ix1;

    // check PTE1 not already mapped
    if ( ident == 0 )
    {
        if ( _physical_read( paddr ) & PTE_V )
        {
            _printf("\n[GIET ERROR] in _v2p_add_pte1() : vpn %x already mapped "
                    "in PTAB[%d,%d] for vspace %d\n", vpn , x , y , vspace_id );
            _spin_lock_release( &_ptabs_spin_lock[vspace_id][x][y] );
            _exit();
        }
    }

    // compute pte1 : 2 bits V T / 8 bits flags / 3 bits RSVD / 19 bits bppi
    pte1 = PTE_V | (flags & 0x3FC00000) | ((ppn>>9) & 0x0007FFFF);

    // write pte1 in PT1
    _physical_write( paddr , pte1 );

    // release lock protecting PTAB[vspace_id][x][y]
    _spin_lock_release( &_ptabs_spin_lock[vspace_id][x][y] );

    asm volatile ("sync");

}   // end _v2p_add_pte1()



///////////////////////////////////////////
void _v2p_add_pte2( unsigned int vspace_id,
                    unsigned int x,
                    unsigned int y,
                    unsigned int vpn,        // 20 bits right-justified
                    unsigned int flags,      // 10 bits left-justified 
                    unsigned int ppn,        // 28 bits right-justified
                    unsigned int ident )     // identity mapping if non zero
{
    unsigned int ix1;
    unsigned int ix2;
    paddr_t      pt2_pbase;     // PT2 physical base address
    paddr_t      pte2_paddr;    // PTE2 physical address
    unsigned int pt2_id;        // PT2 index
    unsigned int ptd;           // PTD : entry in PT1

    ix1 = vpn >> 9;             // 11 bits for ix1
    ix2 = vpn & 0x1FF;          //  9 bits for ix2

    // get page table physical base address 
    paddr_t      pt1_pbase = _ptabs_paddr[vspace_id][x][y];

    if ( pt1_pbase == 0 )
    {
        _printf("\n[GIET ERROR] in _v2p_add_pte2() : no PTAB for vspace %d "
                "in cluster[%d,%d]\n", vspace_id , x , y );
        _exit();
    }

    // get lock protecting PTAB[vspace_id][x][y]
    _spin_lock_acquire( &_ptabs_spin_lock[vspace_id][x][y] );

    // get ptd in PT1
    ptd = _physical_read( pt1_pbase + 4 * ix1 );

    if ((ptd & PTE_V) == 0)    // undefined PTD: compute PT2 base address, 
                               // and set a new PTD in PT1 
    {
        // get a new pt2_id
        pt2_id = _ptabs_next_pt2[vspace_id][x][y];
        _ptabs_next_pt2[vspace_id][x][y] = pt2_id + 1;

        // check overflow
        if (pt2_id == _ptabs_max_pt2) 
        {
            _printf("\n[GIET ERROR] in _v2p_add_pte2() : PTAB[%d,%d,%d]"
                    " contains not enough PT2s\n", vspace_id, x, y );
            _spin_lock_release( &_ptabs_spin_lock[vspace_id][x][y] );
            _exit();
        }

        pt2_pbase = pt1_pbase + PT1_SIZE + PT2_SIZE * pt2_id;
        ptd = PTE_V | PTE_T | (unsigned int) (pt2_pbase >> 12);

        // set PTD into PT1
        _physical_write( pt1_pbase + 4*ix1, ptd);
    }
    else                       // valid PTD: compute PT2 base address
    {
        pt2_pbase = ((paddr_t)(ptd & 0x0FFFFFFF)) << 12;
    }

    // set PTE in PT2 : flags & PPN in two 32 bits words
    pte2_paddr  = pt2_pbase + 8 * ix2;
    _physical_write(pte2_paddr     , (PTE_V | flags) );
    _physical_write(pte2_paddr + 4 , ppn );

    // release lock protecting PTAB[vspace_id][x][y]
    _spin_lock_release( &_ptabs_spin_lock[vspace_id][x][y] );

    asm volatile ("sync");

}   // end _v2p_add_pte2()

////////////////////////////////////////////
void _v2p_del_pte1( unsigned int vspace_id,
                    unsigned int x,
                    unsigned int y,
                    unsigned int vpn )       // 20 bits right-justified
{
    unsigned int ix1 = vpn >> 9;             // 11 bits for ix1

    // get page table physical base address 
    paddr_t pt1_pbase = _ptabs_paddr[vspace_id][x][y];

    // check PTAB defined
    if ( pt1_pbase == 0 )
    {
        _printf("\n[GIET ERROR] in _v2p_del_pte1() : no PTAB for vspace %d "
                "in cluster[%d,%d]\n", vspace_id , x , y );
        _exit();
    }

    // get pte1 in PT1
    paddr_t pte1_paddr = pt1_pbase + 4 * ix1;
    unsigned int pte1 = _physical_read( pte1_paddr );

    // check pte1 valid
    if ((pte1 & PTE_V) == 0)    
    {
        _printf("\n[GIET ERROR] in _v2p_del_pte1() : vpn %x not mapped in PT1"
                "for vspace %d in cluster[%d,%d]\n", vpn , vspace_id , x , y );
        _exit();
    }

    // invalidate PTE1 in PT1 
    _physical_write( pte1_paddr , 0 );

}   // end _v2p_del_pte1()
 
////////////////////////////////////////////
void _v2p_del_pte2( unsigned int vspace_id,
                    unsigned int x,
                    unsigned int y,
                    unsigned int vpn )       // 20 bits right-justified
{
    unsigned int ix1 = vpn >> 9;             // 11 bits for ix1
    unsigned int ix2 = vpn & 0x1FF;          //  9 bits for ix2

    // get page table physical base address 
    paddr_t pt1_pbase = _ptabs_paddr[vspace_id][x][y];

    // check PTAB defined
    if ( pt1_pbase == 0 )
    {
        _printf("\n[GIET ERROR] in _v2p_del_pte2() : no PTAB for vspace %d "
                "in cluster[%d,%d]\n", vspace_id , x , y );
        _exit();
    }

    // get ptd in PT1
    unsigned int ptd = _physical_read( pt1_pbase + 4 * ix1 );

    // check ptd valid
    if ((ptd & PTE_V) == 0)    
    {
        _printf("\n[GIET ERROR] in _v2p_del_pte2() : vpn %x not mapped in PT1"
                "for vspace %d in cluster[%d,%d]\n", vpn , vspace_id , x , y );
        _exit();
    }

    // get PT2 physical base address
    paddr_t  pt2_pbase = ((paddr_t)(ptd & 0x0FFFFFFF)) << 12;

    // invalidate PTE in PT2 
    paddr_t pte2_paddr  = pt2_pbase + 8 * ix2;
    _physical_write( pte2_paddr , 0 );

    asm volatile ("sync");

}  // end _v2p_del_pte2()



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