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chore: read and write from flash refactor
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@specialfish9
specialfish9 committed Sep 13, 2022
1 parent e6c5951 commit 6bc7165
Showing 1 changed file with 64 additions and 44 deletions.
108 changes: 64 additions & 44 deletions src/vm_support.c
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,12 @@ static inline int chose_frame(void);
* */
static inline void toggle_int(int on);

/*TODO doc*/
static inline unsigned int read_from_flash(const int asid, const unsigned int pg_no, const unsigned int dest);

/*TODO doc*/
static inline unsigned int write_to_flash(const int asid, const unsigned int data);

/**
* @brief Aggiorna il TLB con le entryHI e entryLO passate. Esegue prima una
* probe per controllare e' gia' presente un'entry con entryHi corrispondente
Expand Down Expand Up @@ -150,34 +156,17 @@ inline void tlb_exc_handler(void)
toggle_int(FALSE);

/* Marco la pagina come invalida */
proc_pgtbl_entry->pte_entryLO ^= ENTRYLO_VALID;
if (proc_pgtbl_entry->pte_entryLO & ENTRYLO_VALID)
proc_pgtbl_entry->pte_entryLO ^= ENTRYLO_VALID;

/* Aggiorno il TLB */
update_tlb(proc_pgtbl_entry->pte_entryHI, proc_pgtbl_entry->pte_entryLO);

/* Riabilito gli interrupt */
toggle_int(TRUE);

/* Guadagno l'accesso al device in mutua esclusione */
SYSCALL(PASSEREN,
(unsigned int)&dev_sems[FLASH_SEMS][act_proc_sup->sup_asid - 1],
0, 0);

/* Prendo i registri del device */
dtpreg_t *dev_reg =
(dtpreg_t *)DEV_REG_ADDR(FLASHINT, act_proc_sup->sup_asid - 1);

/* Metto in data0 il pfn che voglio scrivere */
dev_reg->data0 = ENTRYLO_GET_PFN(proc_pgtbl_entry->pte_entryLO);

/* Scrivo su command il comando per scrivere (lol)*/
unsigned int dev_stat =
SYSCALL(DOIO, (unsigned int)&dev_reg->command, FLASHWRITE, 0);

/* Rilascio la mutua esclusione */
SYSCALL(VERHOGEN,
(unsigned int)&dev_sems[FLASH_SEMS][act_proc_sup->sup_asid - 1],
0, 0);
/* Scrivo nel dispostivio flash i dati presenti al pfn */
unsigned int dev_stat = write_to_flash(act_proc_sup->sup_asid, ENTRYLO_GET_PFN(proc_pgtbl_entry->pte_entryLO));

/* Controllo che la DO IO sia andata a buon fine */
if (dev_stat != READY) {
Expand All @@ -186,32 +175,13 @@ inline void tlb_exc_handler(void)
}
}

/* Guadagno l'accesso al device in mutua esclusione */
SYSCALL(PASSEREN,
(unsigned int)&dev_sems[FLASH_SEMS][act_proc_sup->sup_asid - 1], 0,
0);

/* Prendo il device register del dispositivo flash associato al processo */
dtpreg_t *dev_reg =
(dtpreg_t *)DEV_REG_ADDR(FLASHINT, act_proc_sup->sup_asid - 1);

/* Scrivi il contenuto di data0 sul frame della swap pool scelto */
/* Calcolo l'indirizzo di destinazione della swap pool */
unsigned int sp_addr = (unsigned int)SWAP_POOL_BEGIN + (chosen_frame * PAGESIZE);
dev_reg->data0 = sp_addr;

/* Imposto il command */
unsigned int cmdval = (/*TODO mpg_no*/0 << 8) | FLASHREAD;
/* Leggo dal flash device */
unsigned int dev_stat = read_from_flash(act_proc_sup->sup_asid, mpg_no, sp_addr);

/* Uso la NSYS5 per dire al controller del device di leggere */
unsigned int dev_stat =
SYSCALL(DOIO, (unsigned int)&dev_reg->command, cmdval, 0);

/* Rilascio la mutua esclusione */
SYSCALL(VERHOGEN,
(unsigned int)&dev_sems[FLASH_SEMS][act_proc_sup->sup_asid - 1], 0,
0);

/* Controllo che la DO IO sia andata a buon fine */
/* Controllo che la lettura sia andata a buon fine */
if (dev_stat != READY) {
LOGi("error reading frame content from dev", dev_stat);
return;
Expand Down Expand Up @@ -292,3 +262,53 @@ void toggle_int(int on)
setSTATUS((getSTATUS() | 1) ^ 1);
}
}

unsigned int read_from_flash(const int asid, const unsigned int pg_no, const unsigned int dest)
{
dtpreg_t *dev_reg;
unsigned int cmdval;
unsigned int dev_stat;

/* Guadagno l'accesso al device in mutua esclusione */
SYSCALL(PASSEREN, (unsigned int)&dev_sems[FLASH_SEMS][asid - 1], 0, 0);

/* Prendo il device register del dispositivo flash associato all'asid */
dev_reg = (dtpreg_t *)DEV_REG_ADDR(FLASHINT, asid - 1);

/* Scrivi il contenuto di data0 nella destinazione scelta */
dev_reg->data0 = dest;

/* Imposto il command */
cmdval = (pg_no << 8) | FLASHREAD;

/* Uso la NSYS5 per dire al controller del device di leggere */
dev_stat = SYSCALL(DOIO, (unsigned int)&dev_reg->command, cmdval, 0);

/* Rilascio la mutua esclusione */
SYSCALL(VERHOGEN, (unsigned int)&dev_sems[FLASH_SEMS][asid - 1], 0, 0);

return dev_stat;
}

unsigned int write_to_flash(const int asid, const unsigned int data)
{
unsigned int dev_stat;
dtpreg_t *dev_reg;

/* Guadagno l'accesso al device in mutua esclusione */
SYSCALL(PASSEREN, (unsigned int)&dev_sems[FLASH_SEMS][asid], 0, 0);

/* Prendo i registri del device */
dev_reg = (dtpreg_t *)DEV_REG_ADDR(FLASHINT, asid);

/* Metto in data0 ciò che voglio scrivere */
dev_reg->data0 = data;

/* Scrivo su command il comando per scrivere (lol)*/
dev_stat = SYSCALL(DOIO, (unsigned int)&dev_reg->command, FLASHWRITE, 0);

/* Rilascio la mutua esclusione */
SYSCALL(VERHOGEN, (unsigned int)&dev_sems[FLASH_SEMS][asid], 0, 0);

return dev_stat;
}

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