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

[Michael S. Tsirkin]

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.

> ---
> 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