Commit 7bf8ef19 authored by Gabriel L. Somlo's avatar Gabriel L. Somlo Committed by Gerd Hoffmann
Browse files

E820: Add interface for accessing e820 table 



Add the following two functions:

  - e820_get_num_entries() - query the size of the e820 table
  - e820_get_entry() - grab an entry matching a given set of criteria

This interface is currently necessary for creating type 19
(memory array mapped address) structures in smbios.

Signed-off-by: default avatarGabriel Somlo <somlo@cmu.edu>
Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
parent 3458b2b0

hw/i386/pc.c

+15 −0
Original line number Diff line number Diff line
@@ -612,6 +612,21 @@ int e820_add_entry(uint64_t address, uint64_t length, uint32_t type) 
    return e820_entries;

}



int e820_get_num_entries(void)

{

    return e820_entries;

}



bool e820_get_entry(int idx, uint32_t type, uint64_t *address, uint64_t *length)

{

    if (idx < e820_entries && e820_table[idx].type == cpu_to_le32(type)) {

        *address = le64_to_cpu(e820_table[idx].address);

        *length = le64_to_cpu(e820_table[idx].length);

        return true;

    }

    return false;

}



/* Calculates the limit to CPU APIC ID values

 *

 * This function returns the limit for the APIC ID value, so that all

include/hw/i386/pc.h

+2 −0
Original line number Diff line number Diff line
@@ -239,6 +239,8 @@ uint16_t pvpanic_port(void); 
#define E820_UNUSABLE   5



int e820_add_entry(uint64_t, uint64_t, uint32_t);

int e820_get_num_entries(void);

bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);



#define PC_Q35_COMPAT_1_7 \

        PC_COMPAT_1_7, \