Re: [Qemu-devel] [PATCH v2 04/20] hw/i386/pc: Add the E820Type enum type

[Philippe Mathieu-Daudé]

On 6/20/19 5:31 PM, Michael S. Tsirkin wrote:
> On Thu, Jun 13, 2019 at 04:34:30PM +0200, Philippe Mathieu-Daudé wrote:
>> This ensure we won't use an incorrect value.
>>
>> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
> 
> It doesn't actually ensure anything: compiler does not check IIUC.
> 
> And OTOH it's stored in type field in struct e820_entry.

I totally missed that... Thanks!

>> ---
>> v2: Do not cast the enum (Li)
>> ---
>>  hw/i386/pc.c         |  4 ++--
>>  include/hw/i386/pc.h | 16 ++++++++++------
>>  2 files changed, 12 insertions(+), 8 deletions(-)
>>
>> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
>> index 5a7cffbb1a..86ba554439 100644
>> --- a/hw/i386/pc.c
>> +++ b/hw/i386/pc.c
>> @@ -872,7 +872,7 @@ static void handle_a20_line_change(void *opaque, int 
>> irq, int level)
>>      x86_cpu_set_a20(cpu, level);
>>  }
>>  
>> -ssize_t e820_add_entry(uint64_t address, uint64_t length, uint32_t type)
>> +ssize_t e820_add_entry(uint64_t address, uint64_t length, E820Type type)
>>  {
>>      unsigned int index = le32_to_cpu(e820_reserve.count);
>>      struct e820_entry *entry;
>> @@ -906,7 +906,7 @@ size_t e820_get_num_entries(void)
>>      return e820_entries;
>>  }
>>  
>> -bool e820_get_entry(unsigned int idx, uint32_t type,
>> +bool e820_get_entry(unsigned int idx, E820Type type,
>>                      uint64_t *address, uint64_t *length)
>>  {
>>      if (idx < e820_entries && e820_table[idx].type == cpu_to_le32(type)) {
>> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
>> index c56116e6f6..7c07185dd5 100644
>> --- a/include/hw/i386/pc.h
>> +++ b/include/hw/i386/pc.h
>> @@ -282,12 +282,16 @@ void pc_system_firmware_init(PCMachineState *pcms, 
>> MemoryRegion *rom_memory);
>>  void pc_madt_cpu_entry(AcpiDeviceIf *adev, int uid,
>>                         const CPUArchIdList *apic_ids, GArray *entry);
>>  
>> -/* e820 types */
>> -#define E820_RAM        1
>> -#define E820_RESERVED   2
>> -#define E820_ACPI       3
>> -#define E820_NVS        4
>> -#define E820_UNUSABLE   5
>> +/**
>> + * E820Type: Type of the e820 address range.
>> + */
>> +typedef enum {
>> +    E820_RAM        = 1,
>> +    E820_RESERVED   = 2,
>> +    E820_ACPI       = 3,
>> +    E820_NVS        = 4,
>> +    E820_UNUSABLE   = 5
>> +} E820Type;
>>  
>>  ssize_t e820_add_entry(uint64_t, uint64_t, uint32_t);
>>  size_t e820_get_num_entries(void);
>> -- 
>> 2.20.1