MFSH_DOVOLIO - Read sectors

Purpose   

Read the specified sectors. 

Calling Sequence   

int far pascal MFSH_DOVOLIO(pcData, pcSec, ulSec)

char far * pcData;
unsigned short far * pcSec;
unsigned long ulSec;

Where   

pcData is a pointer to the data area. The data area must be below the 1- 
Meg boundary. 

pcSec is a pointer to the word which specifies the number of sectors to be 
read. On return, it is filled in by the helper with the number of sectors 
successfully read. 

ulSec is the sector number for the beginning of the sector run. 
  

Returns   

If no error is detected, a zero error code is returned. If an error is 
detected, one of the following error codes is returned: 

oERROR_PROTECTION_VIOLATION 

the supplied address or length is invalid. 

oERROR_INVALID_FUNCTION 

either bit 0 of the boot mode flags was set on entry to OS2LDR or the 
system is not in stage 1. 
  

Remarks   

The only media which can be read by this call is the boot volume. The 
machine's interrupt 13H BIOS function is used to actually do the disk 
reads. The data area will be locked and unlocked by this helper. Soft 
errors are retried automatically. Hard errors are reported to the user 
through a message and the system is stopped.