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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: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gabriel L. Somlo 2014-04-23 09:42:36 -04:00 committed by Gerd Hoffmann
parent 3458b2b075
commit 7bf8ef196e
2 changed files with 17 additions and 0 deletions
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15
hw/i386/pc.c
View File

@ -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

2
include/hw/i386/pc.h
View File

@ -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, \